CVE-2026-26137
published 2026-03-19CVE-2026-26137: Server-side request forgery (ssrf) in Microsoft Exchange allows an authorized attacker to elevate privileges over a network.
PriorityP262critical9.9CVSS 3.1
AVNACLPRLUINSCCHIHAL
EPSS
0.54%
41.2th percentile
Server-side request forgery (ssrf) in Microsoft Exchange allows an authorized attacker to elevate privileges over a network.
Affected
2 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| microsoft | microsoft_exchange_online | — | — |
| msrc | microsoft_exchange_online | — | — |
Detection & IOCsextracted from sources · hover to see the quote
- ·Vulnerability is fully mitigated by Microsoft on the cloud side; no customer action or patch deployment is required. No exploit code or active exploitation has been observed. ↗
- ·CVE is informational/transparency only — no update links or remediation steps are provided because the fix was applied server-side by Microsoft. ↗
- ·Exploit status is confirmed as neither publicly disclosed nor actively exploited at time of publication. ↗
CVSS provenance
nvdv3.19.9CRITICALCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L
vendor_msrc9.9CRITICAL
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Microsoft
Microsoft Exchange Elevation of Privilege Vulnerability
vendor_msrc·2026-03-10·CVSS 9.9
CVE-2026-26137 [CRITICAL] CWE-918 Microsoft Exchange Elevation of Privilege Vulnerability
Microsoft Exchange Elevation of Privilege Vulnerability
Description: Server-side request forgery (ssrf) in Microsoft Exchange allows an authorized attacker to elevate privileges over a network.
FAQ: Why are there no links to an update or instructions with steps that must be taken to protect from this vulnerability?
This vulnerability has already been fully mitigated by Microsoft. There is no action for users of this service to take. The purpose of this CVE is to provide further transparency.
Please see Toward greater transparency: Unveiling Cloud Service CVEs for more information.
Microsoft Exchange: Microsoft Exchange
Microsoft: Microsoft
Customer Action Required: No
Impact: Elevation of Privilege
Exploit Status: Publicly Disclosed:No;Exploited:No;Latest Software Release:N/A
GHSA
GHSA-88qf-p934-h9qg: Server-side request forgery (ssrf) in Microsoft 365 Copilot's Business Chat allows an authorized attacker to elevate privileges over a network
ghsa_unreviewed·2026-03-19
CVE-2026-26137 [HIGH] CWE-918 GHSA-88qf-p934-h9qg: Server-side request forgery (ssrf) in Microsoft 365 Copilot's Business Chat allows an authorized attacker to elevate privileges over a network
Server-side request forgery (ssrf) in Microsoft 365 Copilot's Business Chat allows an authorized attacker to elevate privileges over a network.
No detection rules found.
No public exploits indexed.
No writeups or analysis indexed.
2026-03-19
Published