CVE-2026-55424

MEDIUMNVD 5.45.4
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to NVD's CVSS score.

This medium-severity CVE scores 5.4 under NVD CVSS v3. EPSS exploit probability: 0.4% (33rd percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from NVD CVSS v3
Sources: EPSS, NVD CVSS v3
5.4EG
EchelonGraph verdictMonitorRemediate within your standard update timelines (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 5.4Exploit: None knownExposed services: Not assessed

The CVE record names the fixed release — apply it.

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
5.4MEDIUMmedium confidence
EG Risk
24
EG Risk 24/100

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed (value × EchelonGraph’s weight)
Severity54% × 45%
The EG Score, 5.4 of 10.
Exploitation0.4% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: The CVE record names the fixed release. Apply it within your standard update timelines.
EPSS PROB
0.4%
EPSS %ILE
33rd
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).

The CVE record names the fixed release. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

July 9, 2026

Last Modified

July 14, 2026

Advisory Details (5)

Auto-updated Jul 9, 2026
Fix named in the CVE record. Sources: github_commit, github.
GitHub advisoryMentions a patch (unverified)

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 11× in last 7d / 35× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 100 of 137 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 37 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  2. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  3. 2026-10-12 15:55 UTCEG score recompute
  4. 2026-10-11 19:39 UTCEG score recompute
  5. 2026-10-11 16:54 UTCEG score recompute
  6. 2026-10-11 14:17 UTCEG score recompute
  7. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  8. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  9. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  10. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  11. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  12. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  13. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  14. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  15. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  16. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  17. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  18. 2026-10-01 16:00 UTCEG score recompute
  19. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  20. 2026-09-29 15:22 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  21. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  22. 2026-09-28 09:59 UTCEG score recompute
  23. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  24. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  25. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
Show 75 more
  1. 2026-09-24 11:22 UTCEG score recompute
  2. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  3. 2026-09-23 05:52 UTCEG score recompute
  4. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  5. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  6. 2026-09-18 05:27 UTCEG score recompute
  7. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  8. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  9. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  10. 2026-09-15 03:11 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  11. 2026-09-14 06:41 UTCEG score recompute
  12. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  13. 2026-09-13 08:16 UTCEG score recompute
  14. 2026-09-12 03:20 UTCEG score recompute
  15. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  16. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  17. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  18. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  19. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  20. 2026-09-05 22:00 UTCEG score recompute
  21. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  22. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  23. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  24. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  25. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  26. 2026-08-30 06:42 UTCEG score recompute
  27. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  28. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  29. 2026-08-28 02:40 UTCEG score recompute
  30. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  31. 2026-08-27 02:12 UTCEG score recompute
  32. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  33. 2026-08-26 03:47 UTCEG score recompute
  34. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  35. 2026-08-24 20:19 UTCEG score recompute
  36. 2026-08-23 19:23 UTCEG score recompute
  37. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  38. 2026-08-22 20:58 UTCEG score recompute
  39. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  40. 2026-08-21 00:08 UTCEG score recompute
  41. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  42. 2026-08-20 01:39 UTCEG score recompute
  43. 2026-08-19 17:04 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  44. 2026-08-18 22:26 UTCEG score recompute
  45. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  46. 2026-08-17 23:51 UTCEG score recompute
  47. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  48. 2026-08-17 01:26 UTCEG score recompute
  49. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  50. 2026-08-16 03:01 UTCEG score recompute
  51. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  52. 2026-08-15 04:36 UTCEG score recompute
  53. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  54. 2026-08-14 06:11 UTCEG score recompute
  55. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  56. 2026-08-13 07:46 UTCEG score recompute
  57. 2026-08-12 13:51 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  58. 2026-08-12 09:20 UTCEG score recompute
  59. 2026-08-11 10:55 UTCEG score recompute
  60. 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  61. 2026-08-09 13:56 UTCEG score recompute
  62. 2026-08-09 13:46 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  63. 2026-08-08 16:37 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  64. 2026-08-07 17:06 UTCEG score recompute
  65. 2026-08-06 18:41 UTCEG score recompute
  66. 2026-08-06 13:47 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  67. 2026-08-05 20:16 UTCEG score recompute
  68. 2026-08-05 19:17 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  69. 2026-08-04 21:52 UTCEG score recompute
  70. 2026-08-04 15:10 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  71. 2026-08-04 10:39 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  72. 2026-08-03 22:06 UTCEG score recompute
  73. 2026-08-03 10:36 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  74. 2026-08-02 23:41 UTCEG score recompute
  75. 2026-08-02 02:27 UTCEPSS rescoreEPSS 0.3% · 22nd percentile

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-55424?
CVE-2026-55424 is a medium-severity vulnerability; its CVE record was 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 the CVE record for CVE-2026-55424 published?
The CVE record for CVE-2026-55424 was published on July 9, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of July 14, 2026; the record at its source may have been updated since.
Is CVE-2026-55424 actively exploited?
CVE-2026-55424 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (33rd percentile of EPSS-scored CVEs).
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?
The CVE record for CVE-2026-55424 names the fix: "This issue is fixed in versions 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5."

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