CVE-2025-63417: A Stored Cross-Site Scripting (XSS) vulnerability in the chat functionality of the SelfBest platform 2023.3 al

This week

HIGH 7.2REMOTEDOWNGRADE

CVE-2025-63417 is a high-severity flaw (CVSS 7.2) affecting selfbest. 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 the chat functionality of the SelfBest platform 2023.3 allows authenticated attackers to inject arbitrary web scripts or HTML via the chat message input field. This malicious content is stored and then executed in the context of other users' browsers when they view the malicious message, potentially leading to session hijacking, account takeover, or other client-side attacks.

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	7.2 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.2% (top 84%)
CISA exploited list	No
Weakness	CWE-79
Published	2025-11-05
Last modified	2026-10-27

Publisher (CNA): MITRE · Vendor: selfbest

Last updated 2026-10-27 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-11-05 19:16 UTCPublished CVE record published
2026-10-27 12:10 UTCUpdated Record last modified

selfbest selfbest DOWNGRADE

Affected: 2023.3

Fixed in: no fixed release known

Safe to downgrade to: a release before 2023.3

1. Check installed version

apt-cache policy selfbest || rpm -q selfbest || selfbest --version

2. No fixed release: DOWNGRADE to a release before 2023.3 (Debian / Ubuntu)

apt-cache madison selfbest sudo apt install selfbest=<VERSION_BEFORE_2023.3> sudo apt-mark hold selfbest

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

dnf --showduplicates list selfbest sudo dnf downgrade selfbest-<VERSION_BEFORE_2023.3> sudo dnf versionlock add selfbest

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-2025-63417?

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

Is CVE-2025-63417 being exploited?

CVE-2025-63417 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-2025-63417 affect?

CVE-2025-63417 affects selfbest. Severity is high (CVSS 7.2). A Stored Cross-Site Scripting (XSS) vulnerability in the chat functionality of the SelfBest platform 2023.3 allows authenticated attackers to inject arbitrary web scripts or HTML via the chat message input field. This malicious content is s

How urgent is CVE-2025-63417?

Priority 39/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2025-63418 MEDIUM 6.1 DOWNGRADE A DOM-based Cross-Site Scripting (XSS) vulnerability in the SelfBest platform 2023.3 allows attackers to execu

References

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