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Fencer Vulns
medium 6.3

CVE-2026-88859 json

Evolution: evolution: javascript execution via spoofed vcard control bypasses mail script-markup restriction

published 2026-09-10 1 mo ago modified 2026-11-06 3 d ago also EUVD-2026-75397

cvss
6.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 44%
public exploits
0
none known

Summary

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.

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-88859 updated cvss 6.3

evolution: evolution: javascript execution via spoofed vCard control bypasses mail script-markup restriction

  • Red Hat Enterprise Linux 6 evolution, evolution-pst, evolution-help, evolution-perl, evolution-conduits, evolution-spamassassin
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 7 evolution, evolution-pst, evolution-help, evolution-tests, evolution-langpacks, evolution-bogofilter, +1 more Red Hat Enterprise Linux 8 evolution, evolution-pst, evolution-help, evolution-langpacks, evolution-bogofilter, evolution-spamassassin Red Hat Enterprise Linux 9 evolution, evolution-pst, evolution-help, evolution-langpacks, evolution-bogofilter, evolution-spamassassin
    affected: workaround, no fix available “Fix deferred”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
1 mo ago

Exploit prediction

0.53% chance of exploitation in the next 30 days, higher than 44% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 6.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L

Affected products

  • Red Hat Red Hat Enterprise Linux 6
  • Red Hat Red Hat Enterprise Linux 7
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 9

Classification

Weakness
  • CWE-84 Improper Neutralization of Encoded URI Schemes in a Web Page

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.