CVE-2026-55424

MEDIUMNVD 5.45.4—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.4 under NVD CVSS v3. EPSS exploit probability: 0.3%, top 81% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Trending — 4 sources updated this week
5.4
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 5.4Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
5.4
EG Score
5.4(medium)
EPSS
18.8%
KEV
Not listed

Published

July 9, 2026

Last Modified

July 14, 2026

Advisory Details (5)

Auto-updated Jul 9, 2026
Patch available. Sources: github_commit, github.
github Patch Available

Topic featured link susceptible to stored XSS · Advisory · discourse/discourse · GitHub

https://github.com/discourse/discourse/security/advisories/GHSA-695w-7fv8-mxg3
github_commit

commit c9b9405f5bd0 (discourse/discourse)

Fix landed in discourse/discourse commit c9b9405f5bd0 — awaiting tagged release

https://github.com/discourse/discourse/commit/c9b9405f5bd0bf0269e505e28e3aad388d7657c5
github_commit

commit 6828aee9b15c (discourse/discourse)

Fix landed in discourse/discourse commit 6828aee9b15c — awaiting tagged release

https://github.com/discourse/discourse/commit/6828aee9b15c2655d63b515ac919830bd540ff83
github_commit

commit 6679d9a50834 (discourse/discourse)

Fix landed in discourse/discourse commit 6679d9a50834 — awaiting tagged release

https://github.com/discourse/discourse/commit/6679d9a5083488bae10c2adbb345c481c583242c
github_commit

commit 1bce8881e425 (discourse/discourse)

Fix landed in discourse/discourse commit 1bce8881e425 — awaiting tagged release

https://github.com/discourse/discourse/commit/1bce8881e4253d9bbab56f011a12ef899b926b59

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 24× in last 7d / 24× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-15 22:53 UTCEG score recompute
  2. 2026-07-15 16:57 UTCEPSS rescore
  3. 2026-07-15 16:57 UTCEPSS rescore
  4. 2026-07-15 02:00 UTCEPSS rescore
  5. 2026-07-15 02:00 UTCEPSS rescore
  6. 2026-07-15 00:28 UTCEG score recompute
  7. 2026-07-14 02:02 UTCEG score recompute▼ 2.00
  8. 2026-07-14 01:43 UTCNVD updateCVSS v3 → 5.4 · severity → MEDIUM
  9. 2026-07-13 22:31 UTCEPSS rescore
  10. 2026-07-13 14:55 UTCEG score recompute
  11. 2026-07-13 06:13 UTCEPSS rescore
  12. 2026-07-13 06:13 UTCEPSS rescore
  13. 2026-07-13 03:50 UTCEG score recompute
  14. 2026-07-12 16:45 UTCEG score recompute
  15. 2026-07-12 05:46 UTCEPSS rescore
  16. 2026-07-12 05:39 UTCEG score recompute
  17. 2026-07-11 18:34 UTCEG score recompute
  18. 2026-07-11 08:27 UTCEPSS rescore
  19. 2026-07-11 08:27 UTCEPSS rescore
  20. 2026-07-11 07:29 UTCEG score recompute
  21. 2026-07-10 20:23 UTCEG score recompute
  22. 2026-07-10 09:18 UTCEG score recompute
  23. 2026-07-09 22:11 UTCEG score recompute
  24. 2026-07-09 22:10 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-55424?
CVE-2026-55424 is a medium vulnerability published on July 9, 2026. 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…
When was CVE-2026-55424 disclosed?
CVE-2026-55424 was first published in the National Vulnerability Database on July 9, 2026, with the most recent update on July 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-55424 actively exploited?
CVE-2026-55424 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 18.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-55424?
CVE-2026-55424 has a CVSS v3 base score of 5.4 (NVD).
How do I remediate CVE-2026-55424?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-55424, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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