CVE-2026-74997

HIGHPre-NVD 8.88.8—
EchelonGraph scoreHIGH confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-08-17. a secondary CVSS source baseline 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 8.8Exploit: None knownExposed: 0

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

In Roundcube Webmail before 1.6.18 and 1.7.x before 1.7.3, the cmd_learn driver of the markasjunk plugin is subject to remote code execution via crafted placeholder replacement values. This issue only affects Roundcube instances using the markasjunk plugin with its cmd_learn driver.

CVSS v3
8.8
EG Score
8.8(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
Severity88% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
53%
KEV
Not listed

Published

August 17, 2026

Last Modified

August 17, 2026

Advisory Details (6)

Auto-updated Aug 17, 2026
Patch available. Sources: github_release, github_commit.
github_commit

commit 14044f843cfa (roundcube/roundcubemail)

Fix landed in roundcube/roundcubemail commit 14044f843cfa — awaiting tagged release

https://github.com/roundcube/roundcubemail/commit/14044f843cfacbe78b042f659e379d6b4497aa7c
github_release Patch Available

Roundcube Webmail 1.7.3

Patch available: roundcube/roundcubemail 1.7.3

https://github.com/roundcube/roundcubemail/releases/tag/1.7.3
github_commit

commit 495d211638f2 (roundcube/roundcubemail)

Fix landed in roundcube/roundcubemail commit 495d211638f2 — awaiting tagged release

https://github.com/roundcube/roundcubemail/commit/495d211638f222336b20f4744545c53712426c2a
github_commit

commit b8f90e28a46d (roundcube/roundcubemail)

Fix landed in roundcube/roundcubemail commit b8f90e28a46d — awaiting tagged release

https://github.com/roundcube/roundcubemail/commit/b8f90e28a46d42e79a69568cba897f8f4223d9cd
github_release Patch Available

Roundcube Webmail 1.6.18

Patch available: roundcube/roundcubemail 1.6.18

https://github.com/roundcube/roundcubemail/releases/tag/1.6.18
generic

Security updates 1.6.18 and 1.7.3 released

https://roundcube.net/news/2026/08/09/security-updates-1.6.18-and-1.7.3

Vendor Advisories for CVE-2026-74997(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 / 20× 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. 2026-08-21 07:20 UTCEG score recompute
  2. 2026-08-21 07:20 UTCGHSA enrichment
  3. 2026-08-20 22:56 UTCEPSS rescore
  4. 2026-08-20 18:59 UTCGHSA enrichment
  5. 2026-08-20 06:39 UTCGHSA enrichment
  6. 2026-08-19 18:17 UTCEG score recompute
  7. 2026-08-19 18:17 UTCGHSA enrichment
  8. 2026-08-19 17:04 UTCEPSS rescore
  9. 2026-08-19 05:20 UTCGHSA enrichment
  10. 2026-08-18 16:58 UTCEG score recompute
  11. 2026-08-18 16:58 UTCGHSA enrichment
  12. 2026-08-18 13:49 UTCEPSS rescore
  13. 2026-08-18 13:49 UTCEPSS rescore
  14. 2026-08-18 03:41 UTCEG score recompute
  15. 2026-08-18 03:41 UTCGHSA enrichment
  16. 2026-08-17 15:20 UTCEG score recompute
  17. 2026-08-17 14:44 UTCEG score recompute
  18. 2026-08-17 13:30 UTCEG score recompute
  19. 2026-08-17 12:56 UTCEG score recompute
  20. 2026-08-17 12:56 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-74997?
CVE-2026-74997 is a high vulnerability published on August 17, 2026. In Roundcube Webmail before 1.6.18 and 1.7.x before 1.7.3, the cmdlearn driver of the markasjunk plugin is subject to remote code execution via crafted placeholder replacement values. This issue only affects Roundcube instances using the markasjunk plugin with its cmdlearn driver.
When was CVE-2026-74997 disclosed?
CVE-2026-74997 was first published in the National Vulnerability Database on August 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-74997 actively exploited?
CVE-2026-74997 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 47.3% of all scored CVEs.
What is the CVSS score of CVE-2026-74997?
CVE-2026-74997 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-74997?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-74997, 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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