Back
CVE-2026-55424
Discourse: Topic featured link susceptible to stored XSS
High7.4EPSS 0.41%
- Published
- Updated
- Reserved
- Assigned by
- GitHub_M
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.
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 (6 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: total
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.4.
Weakness
Affected products
References (9)
- 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)
- 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://trackcve.app/cve/CVE-2026-55424)Record last updated .