CVE-2026-74998

HIGHPre-NVD 7.27.2—
EchelonGraph scoreMEDIUM confidence

Score 7.2 from GitHub Security Advisory (severity: HIGH) published 2026-08-17. A secondary CVSS source baseline 7.2; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
7.2EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 7.2Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

In Roundcube Webmail before 1.6.18 and 1.7.x before 1.7.3, responses from the CSS (Cascading Style Sheets) proxy were not validated, which may result in information disclosure or XSS (cross-site scripting) via MIME sniffing.

CVSS v3
7.2
EG Score
7.2HIGHmedium confidence
EG Risk
37
EG Risk 37/100CISA 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
Severity72% × 45%
Exploitation0% × 40%
Automatability30% × 15%
CISA SSVC: Track at low or medium mission impact; Track or 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
0.4%
EPSS %ILE
35th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track or 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 (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact partial (CVSS below 9.0). 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 17, 2026

Last Modified

September 8, 2026

Advisory Details (5)

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

commit a2334990c02f (roundcube/roundcubemail)

Fix landed in roundcube/roundcubemail commit a2334990c02f — awaiting tagged release

https://github.com/roundcube/roundcubemail/commit/a2334990c02f7cb77b1a8d6fa97fcd9e1b5cd1fb
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 62d33c8a0dc3 (roundcube/roundcubemail)

Fix landed in roundcube/roundcubemail commit 62d33c8a0dc3 — awaiting tagged release

https://github.com/roundcube/roundcubemail/commit/62d33c8a0dc3fd0dd03984220dc9709e8e0de43b
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-2026-74998(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
roundcube1.6.1+dfsg-1 ... 1.6.5+dfsg-1~deb12u1 (18 versions)
  • every version up to 1.6.5+dfsg-1+deb12u11: fixed in 1.6.5+dfsg-1+deb12u11
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
roundcube1.6.11+dfsg-1 ... 1.6.17+dfsg-1 (12 versions)
  • every version up to 1.6.18+dfsg-0+deb13u1: fixed in 1.6.18+dfsg-0+deb13u1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
roundcube1.6.11+dfsg-1 ... 1.6.17+dfsg-1 (7 versions)
  • every version up to 1.6.18+dfsg-1: fixed in 1.6.18+dfsg-1
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 20× in last 7d / 99× 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 174 total refreshes for this CVE.

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

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-74998?
CVE-2026-74998 is a high vulnerability published on August 17, 2026. In Roundcube Webmail before 1.6.18 and 1.7.x before 1.7.3, responses from the CSS (Cascading Style Sheets) proxy were not validated, which may result in information disclosure or XSS (cross-site scripting) via MIME sniffing.
When was CVE-2026-74998 disclosed?
CVE-2026-74998 was first published on August 17, 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-2026-74998 actively exploited?
CVE-2026-74998 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (35th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-74998?
CVE-2026-74998 has a CVSS base score of 7.2 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-74998?
A fix for CVE-2026-74998 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-74998 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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