CVE-2026-21273: is affected by an Improper Input Validation vulnerability that could result in privilege escalation

This month

HIGH 8.7DOWNGRADE

CVE-2026-21273 is a high-severity flaw (CVSS 8.7) affecting coldfusion. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

is affected by an Improper Input Validation vulnerability that could result in privilege escalation. A low-privileged attacker could exploit this vulnerability to gain unauthorized read and write access. Exploitation of this issue requires user interaction in that a victim must open a malicious file. Scope is changed.

Why this priority

High severity

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

Risk facts

CVSS score	8.7 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	0.9% (top 42%)
CISA exploited list	No
Weakness	CWE-20
Published	2026-08-11
Last modified	2026-08-28

Publisher (CNA): Adobe Systems Incorporated · Vendor: adobe

Last updated 2026-08-28 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-08-11 17:17 UTCPublished CVE record published
2026-08-28 00:16 UTCUpdated Record last modified

adobe coldfusion DOWNGRADE

Affected: 2023 · 2023 update1 · 2023 update10 · 2023 update11 · 2023 update12 · 2023 update13 · 2023 update14 · 2023 update15

Fixed in: no fixed release known

Safe to downgrade to: a release before 2023

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 2023 (Debian / Ubuntu)

apt-cache madison coldfusion sudo apt install coldfusion=<VERSION_BEFORE_2023> sudo apt-mark hold coldfusion

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

dnf --showduplicates list coldfusion sudo dnf downgrade coldfusion-<VERSION_BEFORE_2023> sudo dnf versionlock add coldfusion

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-2026-21273?

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

Is CVE-2026-21273 being exploited?

CVE-2026-21273 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-2026-21273 affect?

CVE-2026-21273 affects coldfusion. Severity is high (CVSS 8.7). is affected by an Improper Input Validation vulnerability that could result in privilege escalation. A low-privileged attacker could exploit this vulnerability to gain unauthorized read and write access. Exploitation of this issue requires

How urgent is CVE-2026-21273?

Priority 45/100. High severity

Software pages

Adobe ColdFusion vulnerabilities

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References

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