CVE-2025-39354: Deserialization of Untrusted Data vulnerability in ThemeGoods Grand Conference grandconference allows Object I

Q: How do I fix CVE-2025-39354?

grand conference: upgrade to newer than 5.3. Exact commands for each OS are on this page.

Q: Is CVE-2025-39354 being exploited?

CVE-2025-39354 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2025-39354 affect?

CVE-2025-39354 affects grand conference. Severity is critical (CVSS 9.8). Deserialization of Untrusted Data vulnerability in ThemeGoods Grand Conference grandconference allows Object Injection.This issue affects Grand Conference: from n/a through <= 5.3.

Q: How urgent is CVE-2025-39354?

Priority 50/100. Critical severity; Remotely exploitable, no login, no user action

This month

CRITICAL 9.8REMOTEUPGRADE

CVE-2025-39354 is a critical-severity flaw (CVSS 9.8) affecting grand conference. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Deserialization of Untrusted Data vulnerability in ThemeGoods Grand Conference grandconference allows Object Injection.This issue affects Grand Conference: from n/a through <= 5.3.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 58%)
CISA exploited list	No
Weakness	CWE-502
Published	2025-05-19
Last modified	2026-06-17

Publisher (CNA): Patchstack · Vendor: themegoods

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

Am I affected?

Timeline

2025-05-19 20:15 UTCPublished CVE record published
2026-06-17 09:17 UTCUpdated Record last modified

themegoods grand conference UPGRADE

Affected: <= 5.3

Fixed in: newer than 5.3

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy grand-conference || rpm -q grand-conference || grand-conference --version

2. UPGRADE to newer than 5.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade grand-conference

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade grand-conference

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

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-2025-39354?

grand conference: upgrade to newer than 5.3. Exact commands for each OS are on this page.

Is CVE-2025-39354 being exploited?

CVE-2025-39354 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-2025-39354 affect?

CVE-2025-39354 affects grand conference. Severity is critical (CVSS 9.8). Deserialization of Untrusted Data vulnerability in ThemeGoods Grand Conference grandconference allows Object Injection.This issue affects Grand Conference: from n/a through <= 5.3.

How urgent is CVE-2025-39354?

Priority 50/100. Critical severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2025-60116 MEDIUM 5.4 UPGRADE Missing Authorization vulnerability in ThemeGoods Grand Conference Theme Custom Post Type grandconference-cust
CVE-2025-64224 HIGH 7.1 UPGRADE Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in ThemeGoo

References

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