CVE-2026-77506

MEDIUMPre-NVD 4.84.8—
EchelonGraph scoreMEDIUM confidence

Score 4.8 from GitHub Security Advisory published 2026-08-20. A secondary CVSS source baseline 4.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
4.8EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 4.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Znuny before LTS 6.5.22 allows AgentTicketEmailResend template XSS.

CVSS v3
4.8
EG Score
4.8MEDIUMmedium confidence
EG Risk
22
EG Risk 22/100CISA 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
Severity48% × 45%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at every mission impact level.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.2%
EPSS %ILE
13th
KEV
Not listed

CISA SSVCTrack at every mission impact level.

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

Exploitation none (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 20, 2026

Last Modified

September 9, 2026

Advisory Details (1)

Auto-updated Aug 20, 2026
Patch available.
generic

ZSA-2026-12

https://www.znuny.org/en/advisories/zsa-2026-12

Vendor Advisories for CVE-2026-77506(1)

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

Affected Packages

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
znuny6.3.2-3 ... 6.5.9-1~bpo12+1 (50 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
znuny6.3.2-3 ... 6.5.9-1~bpo12+1 (50 versions)
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
znuny6.3.2-3 ... 6.5.9-1~bpo12+1 (44 versions)
  • every version up to 6.5.22-1: fixed in 6.5.22-1
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 19× in last 7d / 78× 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 130 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-77506?
CVE-2026-77506 is a medium vulnerability published on August 20, 2026. Znuny before LTS 6.5.22 allows AgentTicketEmailResend template XSS.
When was CVE-2026-77506 disclosed?
CVE-2026-77506 was first published on August 20, 2026, with the most recent update on September 9, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-77506 actively exploited?
CVE-2026-77506 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (13th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-77506?
CVE-2026-77506 has a CVSS base score of 4.8 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-77506?
A fix for CVE-2026-77506 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-77506 are linked in the Vendor Advisories panel on this page.

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