CVE-2024-27517: Webasyst 2.9.9 has a Cross-Site Scripting (XSS) vulnerability, Attackers can create blogs containing malicious

Routine

MEDIUM 5.4DOWNGRADE

CVE-2024-27517 is a medium-severity flaw (CVSS 5.4) affecting webasyst. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Webasyst 2.9.9 has a Cross-Site Scripting (XSS) vulnerability, Attackers can create blogs containing malicious code after gaining blog permissions.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	5.4 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	0.4% (top 63%)
CISA exploited list	No
Weakness	CWE-79
Published	2024-02-29
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: webasyst

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

Am I affected?

Timeline

2024-02-29 01:44 UTCPublished CVE record published
2026-06-17 07:19 UTCUpdated Record last modified

webasyst webasyst DOWNGRADE

Affected: 2.9.9

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.9.9

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 2.9.9 (Debian / Ubuntu)

apt-cache madison webasyst sudo apt install webasyst=<VERSION_BEFORE_2.9.9> sudo apt-mark hold webasyst

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

dnf --showduplicates list webasyst sudo dnf downgrade webasyst-<VERSION_BEFORE_2.9.9> sudo dnf versionlock add webasyst

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-2024-27517?

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

Is CVE-2024-27517 being exploited?

CVE-2024-27517 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-2024-27517 affect?

CVE-2024-27517 affects webasyst. Severity is medium (CVSS 5.4). Webasyst 2.9.9 has a Cross-Site Scripting (XSS) vulnerability, Attackers can create blogs containing malicious code after gaining blog permissions.

How urgent is CVE-2024-27517?

Priority 33/100. Public exploit reference

References

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