CVE-2026-65053

Exploitation

Public exploit code exists. CISA's assessment records a public proof of concept. That is not a report of exploitation in the wild.

SSVC decision

• ExploitationpocPublic proof-of-concept exploit code exists. Not a report of exploitation in the wild.
• AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
• Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.41% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 35.1% of scored records. A rank, not a probability.

NVD base score

5.1 (CVSS v4.0), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

NVD analysis status

Deferred. NVD last modified this record on 2026-10-12.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2026-08-24 14:53Z2 MO AGO

Last updated

2026-08-29 11:47Z2 MO AGO

Reserved

2026-07-21

Assigning CNA

VulnCheck

Record state

PUBLISHED

Severity

Medium (CVSS 5.1)

CNA CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N

Weaknesses

• CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')Base

Data version

5.2

Document digest

7869a02b9c08ac75c5ba09ebad48e701ab6961ed752a34890eefa96ca460f9d4

• www.horde.orghttps://www.horde.org/apps/impproduct
• github.comhttps://github.com/horde/imp/commit/f31449a12e3f945c90015d29524925c4c43f6324patch
• github.comhttps://github.com/horde/imp/pull/107issue-trackingpatch
• github.comHorde IMP v7.2.0 Release Noteshttps://github.com/horde/imp/releases/tag/v7.2.0release-notes
• blog.evan.lathttps://blog.evan.lat/posts/CVE-2026-65053/technical-descriptionexploit
• www.vulncheck.comVulnCheck Advisory: Horde IMP before 7.2.0 Stored Cross-Site Scripting via AppleDouble Viewer Part Namehttps://www.vulncheck.com/advisories/horde-imp-before-stored-cross-site-scripting-via-appledouble-viewer-part-namethird-party-advisory
• seclists.orghttp://seclists.org/fulldisclosure/2026/Aug/115