CVE-2026-12048: Stored cross-site scripting in pgAdmin 4's error-rendering and plan-node-rendering paths

This month

CRITICAL 9.3UPGRADE

CVE-2026-12048 is a critical-severity flaw (CVSS 9.3) affecting pgadmin 4. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Stored cross-site scripting in pgAdmin 4's error-rendering and plan-node-rendering paths. Text returned by a PostgreSQL server (ErrorResponse messages, including object names quoted back inside relation-does-not-exist errors and inside EXPLAIN Recheck Cond / Exact Heap Blocks fields) was passed verbatim through html-react-parser at every user-facing sink — the notifier toasts, FormFooterMessage / FormInput help and error areas, FormNote, ModalPro

Why this priority

Critical severity

A fixed release or distro patch exists.

Risk facts

CVSS score	9.3 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.3% (top 81%)
CISA exploited list	No
Weakness	CWE-79, CWE-116
Published	2026-06-19
Last modified	2026-10-26

Publisher (CNA): PostgreSQL · Vendor: pgadmin

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-19 00:16 UTCPublished CVE record published
2026-10-26 11:10 UTCUpdated Record last modified

pgadmin pgadmin 4 UPGRADE

Affected: >= 6.0 and < 9.16

Fixed in: 9.16

Safe to downgrade to: a release before 6.0

1. Check installed version

apt-cache policy pgadmin-4 || rpm -q pgadmin-4 || pgadmin-4 --version

2. UPGRADE to 9.16 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade pgadmin-4

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade pgadmin-4

Note

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

3. If no update is available yet, DOWNGRADE to a release before 6.0 (Debian / Ubuntu)

apt-cache madison pgadmin-4 sudo apt install pgadmin-4=<VERSION_BEFORE_6.0> sudo apt-mark hold pgadmin-4

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list pgadmin-4 sudo dnf downgrade pgadmin-4-<VERSION_BEFORE_6.0> sudo dnf versionlock add pgadmin-4

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-2026-12048?

pgadmin 4: upgrade to 9.16. Exact commands for each OS are on this page.

Is CVE-2026-12048 being exploited?

CVE-2026-12048 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-2026-12048 affect?

CVE-2026-12048 affects pgadmin 4. Severity is critical (CVSS 9.3). Stored cross-site scripting in pgAdmin 4's error-rendering and plan-node-rendering paths. Text returned by a PostgreSQL server (ErrorResponse messages, including object names quoted back inside relation-does-not-exist errors and inside EXPL

How urgent is CVE-2026-12048?

Priority 37/100. Critical severity

Software pages

React vulnerabilities · PostgreSQL vulnerabilities

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References

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