CVE-2025-50579: A CORS misconfiguration in Nginx Proxy Manager v2.12.3 allows unauthorized domains to access sensitive data, p

Routine

MEDIUM 5.3REMOTEWATCHLISTDOWNGRADE

CVE-2025-50579 is a medium-severity flaw (CVSS 5.3) affecting nginx proxy manager. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A CORS misconfiguration in Nginx Proxy Manager v2.12.3 allows unauthorized domains to access sensitive data, particularly JWT tokens, due to improper validation of the Origin header. This misconfiguration enables attackers to intercept tokens using a simple browser script and exfiltrate them to a remote attacker-controlled server, potentially leading to unauthorized actions within the application.

Why this priority

Remotely exploitable, no login, no user action
On your watchlist

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

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 68%)
CISA exploited list	No
Weakness	CWE-1259
Published	2025-08-19
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: jc21

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

Am I affected?

Timeline

2025-08-19 15:15 UTCPublished CVE record published
2026-06-17 09:35 UTCUpdated Record last modified

jc21 nginx proxy manager DOWNGRADE

Affected: 2.12.3

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.12.3

1. Check installed version

apt-cache policy nginx-proxy-manager || rpm -q nginx-proxy-manager || nginx-proxy-manager --version

2. No fixed release: DOWNGRADE to a release before 2.12.3 (Debian / Ubuntu)

apt-cache madison nginx-proxy-manager sudo apt install nginx-proxy-manager=<VERSION_BEFORE_2.12.3> sudo apt-mark hold nginx-proxy-manager

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

dnf --showduplicates list nginx-proxy-manager sudo dnf downgrade nginx-proxy-manager-<VERSION_BEFORE_2.12.3> sudo dnf versionlock add nginx-proxy-manager

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-2025-50579?

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

Is CVE-2025-50579 being exploited?

CVE-2025-50579 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-2025-50579 affect?

CVE-2025-50579 affects nginx proxy manager. Severity is medium (CVSS 5.3). A CORS misconfiguration in Nginx Proxy Manager v2.12.3 allows unauthorized domains to access sensitive data, particularly JWT tokens, due to improper validation of the Origin header. This misconfiguration enables attackers to intercept toke

How urgent is CVE-2025-50579?

Priority 37/100. Remotely exploitable, no login, no user action; On your watchlist

Software pages

nginx vulnerabilities

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References

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