CVE-2020-26951
published 2020-12-09CVE-2020-26951: A parsing and event loading mismatch in Firefox's SVG code could have allowed load events to fire, even after sanitization. An attacker already capable of…
PriorityP426medium6.1CVSS 3.1
AVNACLPRNUIRSCCLILAN
EPSS
1.04%
59.8th percentile
A parsing and event loading mismatch in Firefox's SVG code could have allowed load events to fire, even after sanitization. An attacker already capable of exploiting an XSS vulnerability in privileged internal pages could have used this attack to bypass our built-in sanitizer. This vulnerability affects Firefox < 83, Firefox ESR < 78.5, and Thunderbird < 78.5.
Affected
12 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | firefox | < firefox 83.0-1 (sid) | firefox 83.0-1 (sid) |
| debian | firefox-esr | < firefox 83.0-1 (sid) | firefox 83.0-1 (sid) |
| debian | thunderbird | < firefox 83.0-1 (sid) | firefox 83.0-1 (sid) |
| mozilla | firefox | < 83 | 83 |
| mozilla | firefox | < 83.0 | 83.0 |
| mozilla | firefox | — | — |
| mozilla | firefox_esr | < 78.5 | 78.5 |
| mozilla | thunderbird | < 78.5 | 78.5 |
| mozilla | thunderbird | >= 0 < 1:78.5.0-1 | 1:78.5.0-1 |
| mozilla | thunderbird | >= 0 < 1:78.5.0-1 | 1:78.5.0-1 |
| mozilla | thunderbird | >= 0 < 1:78.5.0-1 | 1:78.5.0-1 |
| mozilla | thunderbird | >= 0 < 1:78.5.0-1 | 1:78.5.0-1 |
CVSS provenance
nvdv3.16.1MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
nvdv2.04.3MEDIUMAV:N/AC:M/Au:N/C:N/I:P/A:N
osv6.1MEDIUM
vendor_debian6.1MEDIUM
vendor_redhat6.1MEDIUM
Stop checking back — get the weekly exploitation signal.
Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.
Ubuntu
Thunderbird vulnerabilities
vendor_ubuntu·2020-11-25
CVE-2020-16012 Thunderbird vulnerabilities
Title: Thunderbird vulnerabilities
Summary: Several security issues were fixed in Thunderbird.
Multiple security issues were discovered in Thunderbird. If a user were
tricked in to opening a specially crafted website in a browsing context,
an attacker could potentially exploit these to cause a denial of service,
obtain sensitive information across origins, bypass security restrictions,
conduct phishing attacks, conduct cross-site scripting (XSS) attacks,
bypass Content Security Policy (CSP) restrictions, conduct DNS rebinding
attacks, or execute arbitrary code.
Instructions: After a standard system update you need to restart Thunderbird to make
all the necessary changes.
Ubuntu
Firefox vulnerabilities
vendor_ubuntu·2020-11-19
CVE-2020-26958 Firefox vulnerabilities
Title: Firefox vulnerabilities
Summary: Firefox could be made to crash or run programs as your login if it
opened a malicious website.
USN-4637-1 fixed vulnerabilities in Firefox. This update provides the
corresponding updates for Ubuntu 16.04 LTS.
Original advisory details:
Multiple security issues were discovered in Firefox. If a user were
tricked in to opening a specially crafted website, an attacker could
potentially exploit these to cause a denial of service, obtain sensitive
information across origins, bypass security restrictions, conduct phishing
attacks, conduct cross-site scripting (XSS) attacks, bypass Content
Security Policy (CSP) restrictions, conduct DNS rebinding attacks, or
execute arbitrary code.
Instructions: After a standard system update you need to restart Firefox
Ubuntu
Firefox vulnerabilities
vendor_ubuntu·2020-11-18
CVE-2020-26952 Firefox vulnerabilities
Title: Firefox vulnerabilities
Summary: Firefox could be made to crash or run programs as your login if it
opened a malicious website.
Multiple security issues were discovered in Firefox. If a user were
tricked in to opening a specially crafted website, an attacker could
potentially exploit these to cause a denial of service, obtain sensitive
information across origins, bypass security restrictions, conduct phishing
attacks, conduct cross-site scripting (XSS) attacks, bypass Content
Security Policy (CSP) restrictions, conduct DNS rebinding attacks, or
execute arbitrary code.
Instructions: After a standard system update you need to restart Firefox to make
all the necessary changes.
Red Hat
Mozilla: Parsing mismatches could confuse and bypass security sanitizer for chrome privileged code
vendor_redhat·2020-11-17·CVSS 6.1
CVE-2020-26951 [MEDIUM] CWE-354 Mozilla: Parsing mismatches could confuse and bypass security sanitizer for chrome privileged code
Mozilla: Parsing mismatches could confuse and bypass security sanitizer for chrome privileged code
A parsing and event loading mismatch in Firefox's SVG code could have allowed load events to fire, even after sanitization. An attacker already capable of exploiting an XSS vulnerability in privileged internal pages could have used this attack to bypass our built-in sanitizer. This vulnerability affects Firefox < 83, Firefox ESR < 78.5, and Thunderbird < 78.5.
Package: firefox (Red Hat Enterprise Linux 5) - Out of support scope
Debian
CVE-2020-26951: firefox - A parsing and event loading mismatch in Firefox's SVG code could have allowed lo...
vendor_debian·2020·CVSS 6.1
CVE-2020-26951 [MEDIUM] CVE-2020-26951: firefox - A parsing and event loading mismatch in Firefox's SVG code could have allowed lo...
A parsing and event loading mismatch in Firefox's SVG code could have allowed load events to fire, even after sanitization. An attacker already capable of exploiting an XSS vulnerability in privileged internal pages could have used this attack to bypass our built-in sanitizer. This vulnerability affects Firefox < 83, Firefox ESR < 78.5, and Thunderbird < 78.5.
Scope: local
sid: resolved (fixed in 83.0-1)
Mozilla
Mozilla Foundation Security Advisory 2020-51: CVE-2020-26951
vendor_mozilla·CVSS 6.1
CVE-2020-26951 [MEDIUM] Mozilla Foundation Security Advisory 2020-51: CVE-2020-26951
Mozilla Foundation Security Advisory 2020-51
CVE: CVE-2020-26951
Product: Firefox ESR
Impact: high
Fixed in: Firefox ESR 78.5
Mozilla
Mozilla Foundation Security Advisory 2020-52: CVE-2020-26951
vendor_mozilla·CVSS 6.1
CVE-2020-26951 [MEDIUM] Mozilla Foundation Security Advisory 2020-52: CVE-2020-26951
Mozilla Foundation Security Advisory 2020-52
CVE: CVE-2020-26951
Product: Thunderbird
Impact: high
Fixed in: Thunderbird 78.5
Mozilla
Mozilla Foundation Security Advisory 2020-50: CVE-2020-26951
vendor_mozilla·CVSS 6.1
CVE-2020-26951 [MEDIUM] Mozilla Foundation Security Advisory 2020-50: CVE-2020-26951
Mozilla Foundation Security Advisory 2020-50
CVE: CVE-2020-26951
Product: Firefox
Impact: high
Fixed in: Firefox 83
GHSA
GHSA-w7p8-wf2r-rw5h: A parsing and event loading mismatch in Firefox's SVG code could have allowed load events to fire, even after sanitization
ghsa_unreviewed·2022-05-24
CVE-2020-26951 [MEDIUM] CWE-79 GHSA-w7p8-wf2r-rw5h: A parsing and event loading mismatch in Firefox's SVG code could have allowed load events to fire, even after sanitization
A parsing and event loading mismatch in Firefox's SVG code could have allowed load events to fire, even after sanitization. An attacker already capable of exploiting an XSS vulnerability in privileged internal pages could have used this attack to bypass our built-in sanitizer. This vulnerability affects Firefox < 83, Firefox ESR < 78.5, and Thunderbird < 78.5.
OSV
CVE-2020-26951: A parsing and event loading mismatch in Firefox's SVG code could have allowed load events to fire, even after sanitization
osv·2020-12-09·CVSS 6.1
CVE-2020-26951 [MEDIUM] CVE-2020-26951: A parsing and event loading mismatch in Firefox's SVG code could have allowed load events to fire, even after sanitization
A parsing and event loading mismatch in Firefox's SVG code could have allowed load events to fire, even after sanitization. An attacker already capable of exploiting an XSS vulnerability in privileged internal pages could have used this attack to bypass our built-in sanitizer. This vulnerability affects Firefox < 83, Firefox ESR < 78.5, and Thunderbird < 78.5.
No detection rules found.
No public exploits indexed.
No writeups or analysis indexed.
https://bugzilla.mozilla.org/show_bug.cgi?id=1667113https://www.mozilla.org/security/advisories/mfsa2020-50/https://www.mozilla.org/security/advisories/mfsa2020-51/https://www.mozilla.org/security/advisories/mfsa2020-52/https://bugzilla.mozilla.org/show_bug.cgi?id=1667113https://www.mozilla.org/security/advisories/mfsa2020-50/https://www.mozilla.org/security/advisories/mfsa2020-51/https://www.mozilla.org/security/advisories/mfsa2020-52/
2020-12-09
Published