CVE-2025-65858: A Stored Cross-Site Scripting (XSS) vulnerability in Calibre-Web v0.6.25 allows attackers to inject malicious

Routine

LOW 3.5DOWNGRADE

CVE-2025-65858 is a low-severity flaw (CVSS 3.5) affecting calibre-web. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A Stored Cross-Site Scripting (XSS) vulnerability in Calibre-Web v0.6.25 allows attackers to inject malicious JavaScript into the 'username' field during user creation. The payload is stored unsanitized and later executed when the /ajax/listusers endpoint is accessed.

Why this priority

Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	3.5 (Low)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	Required
EPSS exploit chance	0.2% (top 89%)
CISA exploited list	No
Weakness	CWE-79
Published	2025-12-02
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: janeczku

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-12-02 14:16 UTCPublished CVE record published
2026-06-17 09:56 UTCUpdated Record last modified

janeczku calibre-web DOWNGRADE

Affected: 0.6.25

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.6.25

1. Check installed version

apt-cache policy calibre-web || rpm -q calibre-web || calibre-web --version

2. No fixed release: DOWNGRADE to a release before 0.6.25 (Debian / Ubuntu)

apt-cache madison calibre-web sudo apt install calibre-web=<VERSION_BEFORE_0.6.25> sudo apt-mark hold calibre-web

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list calibre-web sudo dnf downgrade calibre-web-<VERSION_BEFORE_0.6.25> sudo dnf versionlock add calibre-web

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-65858?

calibre-web: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-65858 being exploited?

CVE-2025-65858 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-65858 affect?

CVE-2025-65858 affects calibre-web. Severity is low (CVSS 3.5). A Stored Cross-Site Scripting (XSS) vulnerability in Calibre-Web v0.6.25 allows attackers to inject malicious JavaScript into the 'username' field during user creation. The payload is stored unsanitized and later executed when the /ajax/lis

How urgent is CVE-2025-65858?

Priority 20/100. Public exploit reference

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References

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