CVE-2025-4839: A vulnerability has been found in itwanger paicoding 1.0.0/1.0.1/1.0.2/1.0.3 and classified as problematic

Routine

LOW 3.1DOWNGRADE

CVE-2025-4839 is a low-severity flaw (CVSS 3.1) affecting paicoding. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A vulnerability has been found in itwanger paicoding 1.0.0/1.0.1/1.0.2/1.0.3 and classified as problematic. Affected by this vulnerability is an unknown functionality of the file /paicoding-core/src/main/java/com/github/paicoding/forum/core/util/CrossUtil.java. The manipulation leads to permissive cross-domain policy with untrusted domains. The attack can be launched remotely. The complexity of an attack is rather high. The exploitation appears t

Why this priority

Public exploit reference

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

Risk facts

CVSS score	3.1 (Low)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.3% (top 77%)
CISA exploited list	No
Weakness	CWE-346, CWE-942
Published	2025-05-17
Last modified	2026-06-17

Publisher (CNA): VulDB · Vendor: itwanger

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

Am I affected?

Timeline

2025-05-17 22:15 UTCPublished CVE record published
2026-06-17 09:34 UTCUpdated Record last modified

itwanger paicoding DOWNGRADE

Affected: 1.0.0 · 1.0.1 · 1.0.2 · 1.0.3

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.0.0 (Debian / Ubuntu)

apt-cache madison paicoding sudo apt install paicoding=<VERSION_BEFORE_1.0.0> sudo apt-mark hold paicoding

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

dnf --showduplicates list paicoding sudo dnf downgrade paicoding-<VERSION_BEFORE_1.0.0> sudo dnf versionlock add paicoding

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-2025-4839?

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

Is CVE-2025-4839 being exploited?

CVE-2025-4839 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-2025-4839 affect?

CVE-2025-4839 affects paicoding. Severity is low (CVSS 3.1). A vulnerability has been found in itwanger paicoding 1.0.0/1.0.1/1.0.2/1.0.3 and classified as problematic. Affected by this vulnerability is an unknown functionality of the file /paicoding-core/src/main/java/com/github/paicoding/forum/core

How urgent is CVE-2025-4839?

Priority 22/100. Public exploit reference

Software pages

Java vulnerabilities · GitHub vulnerabilities

Related CVEs

CVE-2026-3286 MEDIUM 6.3 DOWNGRADE A vulnerability was identified in itwanger paicoding 1.0.0/1.0.1/1.0.2/1.0.3
CVE-2025-3967 MEDIUM 5.4 DOWNGRADE A vulnerability was found in itwanger paicoding 1.0.3
CVE-2025-3966 MEDIUM 4.3 DOWNGRADE A vulnerability was found in itwanger paicoding 1.0.3 and classified as problematic
CVE-2025-3965 LOW 3.5 DOWNGRADE A vulnerability has been found in itwanger paicoding 1.0.3 and classified as problematic

References

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