CVE-2023-26359
CriticalExploitedPublic exploitAdobe ColdFusion versions 2018 Update 15 (and earlier) and 2021 Update 5 (and earlier) are affected by a Deserialization of Untrusted Data vulnerability that could result in arbitrary code execution in the context of the current user.
Published Mar 23, 2023 · Updated Oct 23, 2025
Key Facts
Patch immediately- CVE-2023-26359 is a critical-severity vulnerability (CVSS 9.8 v3.1) affecting ColdFusion (Adobe).
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Aug 21, 2023. Public exploit code is available.
- EPSS estimates a 17% probability of exploitation in the next 30 days.
- No fixed version is listed yet; check the vendor advisory for mitigations.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
17%
Higher than 97.0% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings
Public exploit code
Available
Proof-of-concept or weaponized module
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Description
Adobe ColdFusion versions 2018 Update 15 (and earlier) and 2021 Update 5 (and earlier) are affected by a Deserialization of Untrusted Data vulnerability that could result in arbitrary code execution in the context of the current user. Exploitation of this issue does not require user interaction.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Aug 21, 2023 | Sep 11, 2023 | Not reported |
| Industry KEV feed | Aug 21, 2023 | Sep 11, 2023 | Not reported |
| CIRCL KEV | Aug 21, 2023 | Sep 11, 2023 | Not reported |
| ENISA EUVD | Aug 21, 2023 | n/a | Not reported |
Required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Affected Products
23 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| ColdFusionAdobe | 2018, 2018-update1, 2018-update10, 2018-update11, 2018-update12, 2018-update13, 2018-update14, 2018-update15 | n/a |
Timeline
Publicly disclosed
Mar 23, 2023
Added to CISA KEV
Aug 21, 2023
Added to Industry KEV feed
Aug 21, 2023
Added to CIRCL KEV
Aug 21, 2023
Added to ENISA EUVD
Aug 21, 2023
Last updated
Oct 23, 2025
Weakness Type
- CWE-502 Deserialization of Untrusted Data
References
- advisoryhttps://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-26359
- patchhttps://helpx.adobe.com/security/products/coldfusion/apsb23-25.html
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
FAQ
Common Questions.
Adobe ColdFusion versions 2018 Update 15 (and earlier) and 2021 Update 5 (and earlier) are affected by a Deserialization of Untrusted Data vulnerability that could result in arbitrary code execution in the context of the current user.
Affected: ColdFusion (Adobe) versions 2018, 2018-update1, 2018-update10, 2018-update11, 2018-update12, 2018-update13, 2018-update14, 2018-update15. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Aug 21, 2023.
Yes. It was added on Aug 21, 2023 with a federal remediation due date of Sep 11, 2023.
Public exploit code is available.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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