VulnerabilityPublished 24 Mar 2026

CVE-2026-33158: craftcms cms · Insecure Direct Object Reference

Affects craftcms cmsSource CVE Database V5

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Not known to be exploited · CVSS 4.9 Medium : upgrade to 5.9.14 or 4.17.8 when convenient.

Data as of 30 Oct 2026, 11:52 UTC

CVSS 4.0 base score

4.9Medium

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 0.3% chance of exploitation in 30 days – higher than 29% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 5.9.14, 4.17.8

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U

Base metrics

Attack Vector: Network
Attack Complexity: Low
Attack Requirements: None
Privileges Required: Low
User Interaction: None
Vulnerable system confidentiality: High
Vulnerable system integrity: None
Vulnerable system availability: None
Subsequent system confidentiality: None
Subsequent system integrity: None
Subsequent system availability: None

Threat metrics

Exploit Maturity: Unreported

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Attack Requirements: None: The successful attack does not depend on the deployment and execution conditions of the vulnerable system. The attacker can expect to be able to reach the vulnerability and execute the exploit under all or most instances of the vulnerability.
Privileges Required: Low: The attacker requires privileges that provide basic capabilities that are typically limited to settings and resources owned by a single low-privileged user. Alternatively, an attacker with Low privileges has the ability to access only non-sensitive resources.
User Interaction: None: The vulnerable system can be exploited without interaction from any human user, other than the attacker.
Vulnerable system confidentiality: High: There is a total loss of confidentiality, resulting in all information within the Vulnerable System being divulged to the attacker. Alternatively, access to only some restricted information is obtained, but the disclosed information presents a direct, serious impact. For example, an attacker steals the administrator's password, or private encryption keys of a web server.
Vulnerable system integrity: None: There is no loss of integrity within the Vulnerable System.
Vulnerable system availability: None: There is no impact to availability within the Vulnerable System.
Subsequent system confidentiality: None: There is no loss of confidentiality within the Subsequent System or all confidentiality impact is constrained to the Vulnerable System.
Subsequent system integrity: None: There is no loss of integrity within the Subsequent System or all integrity impact is constrained to the Vulnerable System.
Subsequent system availability: None: There is no impact to availability within the Subsequent System or all availability impact is constrained to the Vulnerable System.
Exploit Maturity: Unreported: Based on threat intelligence sources each of the following must apply: · No knowledge of publicly available proof-of-concept · No knowledge of reported attempts to exploit this vulnerability · No knowledge of publicly available solutions used to simplify attempts to exploit the vulnerability

Definitions: FIRST CVSS v4.0 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 24 Mar 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade craftcms cms to 5.9.14 or 4.17.8.

Affected software

Product	Affected	Fixed in
craftcmscms	Affected >=5.0.0-RC1 <5.9.14	Fixed in 5.9.14
craftcmscms	Affected >=4.0.0-RC1 <4.17.8	Fixed in 4.17.8

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

To mitigate this vulnerability, organizations should immediately upgrade Craft CMS to versions 4.17.8 or 5.9.14 or later, where the authorization bypass has been fixed. Until upgrades can be applied, administrators should restrict access to the assets/edit-image endpoint to trusted users only and consider implementing additional access controls at the web server or application firewall level to block unauthorized assetId parameters. Conduct an audit of user privileges to ensure that only necessary users have authenticated access to the CMS, minimizing the risk from low-privileged accounts. Monitor access logs for unusual or unauthorized attempts to access asset content via the vulnerable endpoint. If possible, temporarily disable or restrict the use of image editing or preview features that invoke the vulnerable endpoint. Additionally, review and enhance overall access control policies and implement defense-in-depth measures such as network segmentation and strong authentication to reduce the attack surface. Finally, educate users about the importance of safeguarding credentials to prevent exploitation by malicious actors.

Description

CVE-2026-33158 is a medium-severity authorization bypass vulnerability in Craft CMS versions from 4.0.0-RC1 up to but not including 4.17.8, and 5.0.0-RC1 up to but not including 5.9.14. A low-privileged authenticated user can exploit this flaw by calling the assets/edit-image endpoint with an arbitrary assetId, allowing them to access private asset content without proper authorization checks.

Impact

The primary impact of this vulnerability is unauthorized disclosure of private asset files stored within Craft CMS installations. Organizations using affected versions risk exposure of sensitive images or documents that should be restricted to authorized users only. This can lead to data leakage, loss of confidentiality, and potential reputational damage. Attackers with low-level credentials can escalate their access to view private content without needing elevated privileges, increasing the risk from insider threats or compromised low-privilege accounts. While the vulnerability does not allow modification or deletion of assets, the confidentiality breach alone can be significant, especially for organizations handling sensitive media, intellectual property, or personal data. The ease of exploitation over the network without user interaction increases the threat level. However, the requirement for authentication limits exploitation to users with some level of access, reducing the scope compared to unauthenticated vulnerabilities. Overall, this vulnerability poses a moderate risk to organizations relying on Craft CMS for content management, particularly those with sensitive asset repositories.

CWE-639Authorization Bypass Through User-Controlled Key (opens in a new tab)
Base weaknessLikelihood of exploit: HighCWE Top 25 (2025): #24OWASP Top 10 A01:2025: Broken Access Control (opens in a new tab)
The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data.
Architecture and Design
For each and every data access, ensure that the user has sufficient privilege to access the record that is being requested.
Architecture and Design · Implementation
Make sure that the key that is used in the lookup of a specific user's record is not controllable externally by the user or that any tampering can be detected.
Architecture and Design
Use encryption in order to make it more difficult to guess other legitimate values of the key or associate a digital signature with the key so that the server can verify that there has been no tampering.
OWASP Cheat Sheets
Access Control (opens in a new tab)
Authorization Testing Automation (opens in a new tab)
Cross-Site Request Forgery Prevention (opens in a new tab)
Insecure Direct Object Reference Prevention (opens in a new tab)
Authorization (opens in a new tab)
OWASP ASVS 4.0.3
V4.1.2 (opens in a new tab)
V4.2.1 (opens in a new tab)
V8.3.8 (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 31 Mar 2026, 20:33 UTC

WeaknessesCWE-639

Technical details

References

Community reviews

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