CVE-2026-85600

MEDIUMPre-NVD 5.45.4—
EchelonGraph scoreHIGH confidence

Score 5.4 from GitHub Security Advisory published 2026-09-04. a secondary CVSS source baseline 5.4; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
5.4EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.4Exploit: Elevated riskExposed: 0

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

Grav Admin (getgrav/grav-plugin-admin2) versions <= 2.0.19 contain a stored cross-site scripting vulnerability in the tHtml() function (src/lib/stores/i18n.svelte.ts), which substitutes untrusted parameters such as usernames into translation templates before parsing the result as markdown. Grav's server-side username validation (DataUser::isValidUsername) blocks filesystem-dangerous characters but not <, >, ", or ', allowing an attacker to register a username containing an HTML payload. When an administrator views a UI surface that renders the username through tHtml()—such as the two-factor force-disable confirmation prompt or the 'page is locked' editor notice—the payload executes in their authenticated session. Fixed in 2.0.21.

CVSS v3
5.4
EG Score
5.4(high)
EG Risk
40(Track)
EG Risk 40/100SSVC: 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
Severity54% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
13%
KEV
Not listed

Published

September 4, 2026

Last Modified

September 8, 2026

Advisory Details (2)

Auto-updated Sep 4, 2026
🔬 Proof of concept available. Patch available. Sources: github.
generic

Grav Admin before 2.0.21 Stored XSS via username | Advisories | VulnCheck

https://www.vulncheck.com/advisories/grav-admin-before-2.0.21-stored-xss-via-username
github Patch Available🟡 PoC Available

Stored XSS via username/display name: tHtml() interpolates untrusted values into a template before markdown-parsing it, and usernames are not restricted against HTML metacharacters · Advisory · getgrav/grav · GitHub

https://github.com/getgrav/grav/security/advisories/GHSA-96xm-c5hr-59rx

Vendor Advisories for CVE-2026-85600(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 20× in last 7d / 61× 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. 2026-09-25 05:36 UTCEG score recompute
  2. 2026-09-25 05:36 UTCGHSA enrichment
  3. 2026-09-24 14:04 UTCEPSS rescore
  4. 2026-09-24 03:27 UTCEG score recompute
  5. 2026-09-24 03:27 UTCGHSA enrichment
  6. 2026-09-23 17:54 UTCEPSS rescore
  7. 2026-09-23 01:19 UTCEG score recompute
  8. 2026-09-23 01:19 UTCGHSA enrichment
  9. 2026-09-22 16:01 UTCEPSS rescore
  10. 2026-09-21 23:10 UTCEG score recompute
  11. 2026-09-21 23:10 UTCGHSA enrichment
  12. 2026-09-21 21:09 UTCEPSS rescore
  13. 2026-09-20 21:01 UTCEG score recompute
  14. 2026-09-20 21:01 UTCGHSA enrichment
  15. 2026-09-20 20:16 UTCEPSS rescore
  16. 2026-09-19 18:52 UTCEG score recompute
  17. 2026-09-19 18:52 UTCGHSA enrichment
  18. 2026-09-18 19:28 UTCEPSS rescore
  19. 2026-09-18 16:40 UTCEG score recompute
  20. 2026-09-18 16:40 UTCGHSA enrichment
  21. 2026-09-17 19:32 UTCEPSS rescore
  22. 2026-09-17 14:31 UTCEG score recompute
  23. 2026-09-17 14:31 UTCGHSA enrichment
  24. 2026-09-16 14:09 UTCEPSS rescore
  25. 2026-09-16 12:16 UTCEG score recompute
Show 36 more
  1. 2026-09-16 12:16 UTCGHSA enrichment
  2. 2026-09-16 05:15 UTCEPSS rescore
  3. 2026-09-15 10:08 UTCEG score recompute
  4. 2026-09-15 10:07 UTCGHSA enrichment
  5. 2026-09-15 03:12 UTCEPSS rescore
  6. 2026-09-15 03:12 UTCEPSS rescore
  7. 2026-09-14 07:58 UTCEG score recompute
  8. 2026-09-14 07:58 UTCGHSA enrichment
  9. 2026-09-13 05:49 UTCEG score recompute
  10. 2026-09-13 05:49 UTCGHSA enrichment
  11. 2026-09-12 03:41 UTCEG score recompute
  12. 2026-09-12 03:41 UTCGHSA enrichment
  13. 2026-09-11 01:32 UTCEG score recompute
  14. 2026-09-11 01:32 UTCGHSA enrichment
  15. 2026-09-09 23:23 UTCEG score recompute
  16. 2026-09-09 23:23 UTCGHSA enrichment
  17. 2026-09-08 22:01 UTCEPSS rescore
  18. 2026-09-08 20:15 UTCEG score recompute
  19. 2026-09-08 20:14 UTCGHSA enrichment
  20. 2026-09-07 15:39 UTCEG score recompute
  21. 2026-09-07 15:39 UTCGHSA enrichment
  22. 2026-09-06 13:48 UTCEPSS rescore
  23. 2026-09-06 13:31 UTCEG score recompute
  24. 2026-09-06 13:31 UTCGHSA enrichment
  25. 2026-09-05 15:31 UTCEPSS rescore
  26. 2026-09-05 11:22 UTCEG score recompute
  27. 2026-09-05 11:22 UTCGHSA enrichment
  28. 2026-09-05 10:37 UTCEG score recompute
  29. 2026-09-05 10:36 UTCGHSA enrichment
  30. 2026-09-04 14:19 UTCEG score recompute
  31. 2026-09-04 14:19 UTCGHSA enrichment
  32. 2026-09-04 13:59 UTCEG score recompute
  33. 2026-09-04 13:59 UTCGHSA enrichment
  34. 2026-09-04 12:21 UTCEG score recompute
  35. 2026-09-04 11:34 UTCEG score recompute
  36. 2026-09-04 11:33 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-85600?
CVE-2026-85600 is a medium vulnerability published on September 4, 2026. Grav Admin (getgrav/grav-plugin-admin2) versions <= 2.0.19 contain a stored cross-site scripting vulnerability in the tHtml() function (src/lib/stores/i18n.svelte.ts), which substitutes untrusted parameters such as usernames into translation templates before parsing the result as markdown. Grav's…
When was CVE-2026-85600 disclosed?
CVE-2026-85600 was first published in the National Vulnerability Database on September 4, 2026, with the most recent update on September 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-85600 actively exploited?
CVE-2026-85600 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 87.2% of all scored CVEs.
What is the CVSS score of CVE-2026-85600?
CVE-2026-85600 has a CVSS v3 base score of 5.4 (NVD).
How do I remediate CVE-2026-85600?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-85600, 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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