CVE-2026-55424Discourse: Topic featured link susceptible to stored XSS
- 7.4HighCVSS base score
- 0.41%Exploitation in 30 daysEPSS · top 64% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
Discourse is an open-source discussion platform. Prior to 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5, a topic "featured link" was not sufficiently normalized and escaped before being rendered in the topic list, allowing a user who can set a featured link to inject JavaScript when default Content Security Policy protections were modified or disabled. This issue is fixed in versions 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5.
Timeline
ID reserved
By GitHub_M
- 23 days later
· 23 days later
Published
- 1 day later
· 1 day later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| GitHub_MCNA (assigner) | 4.0 | High7.4 | CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N |
| NVDNVD · Analyzed | 4.0 | High7.4 | CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
- EPSS (exploitation in 30 days)
- 0.41% · top 64% of all CVEs (14 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.4.
Affected products
References
References9
- https://github.com/discourse/discourse/security/advisories/GHSA-695w-7fv8-mxg3 (opens in a new tab)x_refsource_CONFIRM
- https://github.com/discourse/discourse/commit/1bce8881e4253d9bbab56f011a12ef899b926b59 (opens in a new tab)x_refsource_MISC
- https://github.com/discourse/discourse/commit/6679d9a5083488bae10c2adbb345c481c583242c (opens in a new tab)x_refsource_MISC
- https://github.com/discourse/discourse/commit/6828aee9b15c2655d63b515ac919830bd540ff83 (opens in a new tab)x_refsource_MISC
- https://github.com/discourse/discourse/commit/c9b9405f5bd0bf0269e505e28e3aad388d7657c5 (opens in a new tab)x_refsource_MISC
- https://github.com/discourse/discourse/releases/tag/v2026.1.5 (opens in a new tab)x_refsource_MISC
- https://github.com/discourse/discourse/releases/tag/v2026.4.2 (opens in a new tab)x_refsource_MISC
- https://github.com/discourse/discourse/releases/tag/v2026.5.1 (opens in a new tab)x_refsource_MISC
- https://github.com/discourse/discourse/releases/tag/v2026.6.0 (opens in a new tab)x_refsource_MISC
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-42733 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-55424)Record last updated .