CVE-2026-73038

MEDIUMPre-NVD 6.16.1—
EchelonGraph scoreMEDIUM confidence

Score 6.1 from GitHub Security Advisory published 2026-08-13. A secondary CVSS source baseline 6.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
6.1EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 6.1Exploit: Elevated riskExposed services: Not assessed

A fix is available — apply it.

NodeBB before 4.15.0 contains a stored cross-site scripting vulnerability in the renderEmoji function that fails to escape tag.icon.url and tag.name attributes. Attackers can deliver malicious ActivityPub Create/Note objects with crafted emoji tags to inject arbitrary HTML and JavaScript into stored post content, executing code in all viewers' browsers.

CVSS v3
6.1
EG Score
6.1MEDIUMmedium confidence
EG Risk
43
EG Risk 43/100CISA SSVC

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
Severity61% × 45%
Exploitation40% × 40%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.2%
EPSS %ILE
14th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 13, 2026

Last Modified

September 24, 2026

Advisory Details (4)

Auto-updated Aug 13, 2026
Patch available. Sources: github_commit, github_release.
generic

NodeBB < 4.15.0 Stored XSS via ActivityPub emoji tag.icon.url and tag.name | Advisories | VulnCheck

https://www.vulncheck.com/advisories/nodebb-stored-xss-via-activitypub-emoji-tag-icon-url-and-tag-name
github_commit Patch Available

commit c0d94a217edc (NodeBB/NodeBB)

Patch available: NodeBB/NodeBB v4.15.0 (contains commit c0d94a217edc)

https://github.com/NodeBB/NodeBB/commit/c0d94a217edcafcdb9b3920a6e80935194bcb19e
github_release Patch Available

v4.15.0

Patch available: NodeBB/NodeBB v4.15.0

https://github.com/NodeBB/NodeBB/releases/tag/v4.15.0
generic

ActivityPub federated stored XSS via emoji tag.icon.url/tag.name · Issue #14601 · NodeBB/NodeBB · GitHub

https://github.com/NodeBB/NodeBB/issues/14601

Vendor Advisories for CVE-2026-73038(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 65× 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.

Showing the most recent 100 of 138 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-73038?
CVE-2026-73038 is a medium vulnerability published on August 13, 2026. NodeBB before 4.15.0 contains a stored cross-site scripting vulnerability in the renderEmoji function that fails to escape tag.icon.url and tag.name attributes. Attackers can deliver malicious ActivityPub Create/Note objects with crafted emoji tags to inject arbitrary HTML and JavaScript into…
When was CVE-2026-73038 disclosed?
CVE-2026-73038 was first published on August 13, 2026, with the most recent update on September 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-73038 actively exploited?
CVE-2026-73038 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (14th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-73038?
CVE-2026-73038 has a CVSS base score of 6.1 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-73038?
A fix for CVE-2026-73038 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-73038 are linked in the Vendor Advisories panel on this page.

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