HOMEVULNERABILITIESCVE-2026-27491
MEDIUM

CVE-2026-27491

CWE-862Published: March 19, 2026· Updated: Mar 25, 2026

4.3
CVSS v3.1
EPSS:0.04%probability of exploitation in 30 daysPercentile:11.4th

Official Description

Discourse is an open-source discussion platform. Prior to versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2, a type coercion issue in a post actions API endpoint allowed non-staff users to issue warnings to other users. Warnings are a staff-only moderation feature. The vulnerability required the attacker to be a logged-in user and to send a specifically crafted request. No data exposure or privilege escalation beyond the ability to create unauthorized user warnings was possible. Versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 contain a patch. No known workarounds are available.

NVD Source

Technical Analysis

CVE-2026-27491 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.Low
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityLow
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

Affected Vendors & Products

discourse1 product
discourse
Source: NVD CPE · 2 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://github.com/discourse/discourse/commit/60a588f4da4ab0feceb2c44787d4261b4f8757be
PATCHhttps://github.com/discourse/discourse/commit/d3cb203feabc46d765ecb91f348613a2bd531b89
PATCHhttps://github.com/discourse/discourse/commit/f5fef73827da7520efc517357bd2a6bab35d7886
ADVISORYhttps://github.com/discourse/discourse/security/advisories/GHSA-xq37-5fvf-4m4j

All References (4)

→
https://github.com/discourse/discourse/commit/60a588f4da4ab0feceb2c44787d4261b4f8757bePatch
→
https://github.com/discourse/discourse/commit/d3cb203feabc46d765ecb91f348613a2bd531b89Patch
→
https://github.com/discourse/discourse/commit/f5fef73827da7520efc517357bd2a6bab35d7886Patch
→
https://github.com/discourse/discourse/security/advisories/GHSA-xq37-5fvf-4m4jVendor Advisory

Quick Facts

CVE IDCVE-2026-27491
CVSS Score4.3 / 10
SeverityMEDIUM
WeaknessCWE-862
CISA KEVNo
EPSS (30d)0.04%
Affected1 vendor
PublishedMar 19, 2026

Related CVEs (CWE-862)

CVE-2026-2031
10.0
CVE-2026-33712
10.0
CVE-2025-30416
10.0
CVE-2026-0092
10.0
CVE-2026-34976
10.0
CVE-2026-46425
9.9

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2026-27491 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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