CVE-2026-7808

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-23. A secondary CVSS source baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.6%CVSS: 9.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

justhtml before 1.16.0 contains multiple HTML sanitization bypass issues that can allow active/dangerous content (e.g., script or style) to survive sanitization, potentially leading to cross-site scripting. The issues primarily affect advanced usage rather than the default JustHTML(..., sanitize=True) path for ordinary parsed HTML: mutating or reusing sanitization policy objects (including exported defaults) could weaken later sanitization; programmatic DOM input to sanitize()/sanitize_dom() could miss mixed-case tag names (e.g., ScRiPt, StYlE); crafted programmatic doctype names could serialize into active markup; and custom policies preserving SVG or MathML could allow animation elements, presentation attributes with external url(...) references, or DOM trees mislabeled as namespace="html" to bypass foreign-content checks. Fixed in 1.16.0.

CVSS v3
9.8
EG Score
9.8CRITICALmedium confidence
EG Risk
59
EG Risk 59/100CISA 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
Severity98% × 45%
Exploitation1% × 40%
Automatability100% × 15%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.6%
EPSS %ILE
46th
KEV
Not listed

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

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (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 23, 2026

Last Modified

August 26, 2026

Advisory Details (2)

Auto-updated Oct 8, 2026
Patch available. Sources: github.
generic

justhtml before 1.16.0 Multiple Security Issues via Sanitization | Advisories | VulnCheck

https://www.vulncheck.com/advisories/justhtml-before-multiple-security-issues-via-sanitization
githubMentions a patch (unverified)

Multiple security fixes in justhtml 1.15.0 found by LLM · Advisory · EmilStenstrom/justhtml · GitHub

https://github.com/EmilStenstrom/justhtml/security/advisories/GHSA-4p64-v8f5-r2gx

Vendor Advisories for CVE-2026-7808(1)

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

Affected Packages

(1 across 1 ecosystem)
PyPI(1)
PackageVulnerable rangeFix by version rangeDependents
justhtml0.1.0 ... 1.9.1 (60 versions)
  • every version up to 1.16.0: fixed in 1.16.0
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 35× in last 7d / 197× 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 342 total refreshes for this CVE.

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

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-7808?
CVE-2026-7808 is a critical vulnerability published on August 23, 2026. justhtml before 1.16.0 contains multiple HTML sanitization bypass issues that can allow active/dangerous content (e.g., script or style) to survive sanitization, potentially leading to cross-site scripting. The issues primarily affect advanced usage rather than the default JustHTML(...,…
When was CVE-2026-7808 disclosed?
CVE-2026-7808 was first published on August 23, 2026, with the most recent update on August 26, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-7808 actively exploited?
CVE-2026-7808 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.6% probability of exploitation in the next 30 days (46th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-7808?
CVE-2026-7808 has a CVSS base score of 9.8 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-7808?
A fix for CVE-2026-7808 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-7808 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-7808

Explore →

Is Your Infrastructure Affected by CVE-2026-7808?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Book a Demo →Browse All CVEs