CVE-2026-88859

MEDIUMPre-NVD 6.36.3—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3%, top 75% of all CVEs by exploit prediction. GitHub Security Advisory enrichment pending alignment with NVD CVSS.

Triggered by: NVD CVSS baseline
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
6.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.3Exploit: None knownExposed: 0

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

A flaw was found in Evolution. A remote attacker can exploit this vulnerability by sending a specially crafted HTML email containing a spoofed vCard control. When a victim clicks on this control, Evolution's trusted JavaScript handler incorrectly assigns an attacker-controlled JavaScript URL to an iframe's source. This action leads to arbitrary JavaScript execution within the mail-viewing context, effectively bypassing the security measures designed to prevent script execution in email content.

CVSS v3
6.3
EG Score
6.3(medium)
EG Risk
28(Track)
EG Risk 28/100SSVC: 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
Severity63% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
25%
KEV
Not listed

Published

September 10, 2026

Last Modified

September 10, 2026

Advisory Details (3)

Auto-updated Sep 10, 2026
Patch available. Sources: redhat.
generic

Mail: Validate clickable preview elements are generated by Evolution (#3388) · Issues · GNOME / evolution · GitLab

https://gitlab.gnome.org/GNOME/evolution/-/work_items/3388
redhat

Bug Access Denied

https://bugzilla.redhat.com/show_bug.cgi?id=2531401
redhat Patch Available

CVE-2026-88859 - Red Hat Customer Portal

Affected: Red Hat Enterprise Linux 8 or OpenShift Container Platform 4, is affected by this vulnerability and a fix may be released to a

https://access.redhat.com/security/cve/CVE-2026-88859

Vendor Advisories for CVE-2026-88859(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 / 35× 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. 2026-09-19 00:52 UTCEG score recompute
  2. 2026-09-19 00:51 UTCGHSA enrichment
  3. 2026-09-18 19:28 UTCEPSS rescore
  4. 2026-09-17 23:54 UTCEG score recompute
  5. 2026-09-17 23:54 UTCGHSA enrichment
  6. 2026-09-17 19:32 UTCEPSS rescore
  7. 2026-09-16 22:23 UTCEG score recompute
  8. 2026-09-16 22:23 UTCGHSA enrichment
  9. 2026-09-16 14:09 UTCEPSS rescore
  10. 2026-09-16 05:15 UTCEPSS rescore
  11. 2026-09-15 21:10 UTCEG score recompute
  12. 2026-09-15 21:10 UTCGHSA enrichment
  13. 2026-09-15 03:12 UTCEPSS rescore
  14. 2026-09-14 20:13 UTCGHSA enrichment
  15. 2026-09-13 19:16 UTCEG score recompute
  16. 2026-09-13 19:16 UTCGHSA enrichment
  17. 2026-09-13 16:48 UTCEPSS rescore
  18. 2026-09-12 18:19 UTCEG score recompute
  19. 2026-09-12 18:19 UTCGHSA enrichment
  20. 2026-09-12 15:02 UTCEPSS rescore
  21. 2026-09-11 17:22 UTCEG score recompute
  22. 2026-09-11 17:22 UTCGHSA enrichment
  23. 2026-09-11 14:53 UTCEPSS rescore
  24. 2026-09-11 14:53 UTCEPSS rescore
  25. 2026-09-10 16:21 UTCEG score recompute
Show 10 more
  1. 2026-09-10 16:21 UTCGHSA enrichment
  2. 2026-09-10 15:22 UTCEG score recompute▲ 0.90
  3. 2026-09-10 15:22 UTCGHSA enrichment
  4. 2026-09-10 15:20 UTCMITRE cvelistV5CVSS v3 → 6.3
  5. 2026-09-10 14:57 UTCEG score recompute
  6. 2026-09-10 14:57 UTCGHSA enrichment
  7. 2026-09-10 12:19 UTCEG score recompute
  8. 2026-09-10 11:45 UTCEG score recompute
  9. 2026-09-10 11:32 UTCEG score recompute
  10. 2026-09-10 11:29 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-88859?
CVE-2026-88859 is a medium vulnerability published on September 10, 2026. A flaw was found in Evolution. A remote attacker can exploit this vulnerability by sending a specially crafted HTML email containing a spoofed vCard control. When a victim clicks on this control, Evolution's trusted JavaScript handler incorrectly assigns an attacker-controlled JavaScript URL to an…
When was CVE-2026-88859 disclosed?
CVE-2026-88859 was first published in the National Vulnerability Database on September 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-88859 actively exploited?
CVE-2026-88859 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 75.0% of all scored CVEs.
What is the CVSS score of CVE-2026-88859?
CVE-2026-88859 has a CVSS v3 base score of 6.3 (NVD).
How do I remediate CVE-2026-88859?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-88859, 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

Explore the affected products and dependency analysis for CVE-2026-88859

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