CVE-2026-73038

MEDIUMPre-NVD 6.16.1—
EchelonGraph scoreHIGH 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%CVSS: 6.1Exploit: Elevated riskExposed: 0

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

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
6.1(high)
EG Risk
43(Track)
EG Risk 43/100SSVC: Track

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%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
9%
KEV
Not listed

Published

August 13, 2026

Last Modified

August 14, 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 26× in last 7d / 29× 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. 2026-08-20 22:56 UTCEPSS rescore
  2. 2026-08-20 18:08 UTCGHSA enrichment
  3. 2026-08-19 18:27 UTCEG score recompute
  4. 2026-08-19 18:27 UTCGHSA enrichment
  5. 2026-08-19 17:04 UTCEPSS rescore
  6. 2026-08-18 17:06 UTCEG score recompute
  7. 2026-08-18 17:05 UTCGHSA enrichment
  8. 2026-08-18 13:49 UTCEPSS rescore
  9. 2026-08-18 13:49 UTCEPSS rescore
  10. 2026-08-17 16:34 UTCEG score recompute
  11. 2026-08-17 16:34 UTCGHSA enrichment
  12. 2026-08-17 13:47 UTCEPSS rescore
  13. 2026-08-16 16:54 UTCEG score recompute
  14. 2026-08-16 16:54 UTCGHSA enrichment
  15. 2026-08-16 14:56 UTCEPSS rescore
  16. 2026-08-16 14:56 UTCEPSS rescore
  17. 2026-08-16 02:15 UTCEPSS rescore
  18. 2026-08-15 17:14 UTCEG score recompute
  19. 2026-08-15 17:14 UTCGHSA enrichment
  20. 2026-08-15 01:31 UTCEPSS rescore
  21. 2026-08-14 17:34 UTCEG score recompute
  22. 2026-08-14 17:34 UTCGHSA enrichment
  23. 2026-08-14 17:07 UTCEG score recompute
  24. 2026-08-14 17:07 UTCGHSA enrichment
  25. 2026-08-14 13:14 UTCEG score recompute
Show 4 more
  1. 2026-08-14 13:14 UTCGHSA enrichment
  2. 2026-08-13 19:19 UTCEG score recompute
  3. 2026-08-13 18:52 UTCEG score recompute
  4. 2026-08-13 18:51 UTCMITRE cvelistV5first tracked

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 in the National Vulnerability Database on August 13, 2026, with the most recent update on August 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-73038 actively exploited?
CVE-2026-73038 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 90.6% of all scored CVEs.
What is the CVSS score of CVE-2026-73038?
CVE-2026-73038 has a CVSS v3 base score of 6.1 (NVD).
How do I remediate CVE-2026-73038?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-73038, 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.

Dependency Blast Radius

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