VulnerabilityPublished 26 May 2026Updated 28 May 2026

CVE-2026-44985: amir20 dozzle · Origin Validation Error

Affects amir20 dozzleSource CVE Database V5

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Not known to be exploited · CVSS 8.7 High : upgrade to 10.5.2 soon.

Data as of 30 Oct 2026, 11:52 UTC

CVSS 4.0 base score

8.7High

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

EPSS: 0.2% chance of exploitation in 30 days – higher than 11% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 10.5.2

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

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

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: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files of the vulnerable system to carry out an attack.
User Interaction: None: The vulnerable system can be exploited without interaction from any human user, other than the attacker.
Vulnerable system confidentiality: None: There is no loss of confidentiality within the Vulnerable System.
Vulnerable system integrity: High: There is a total loss of integrity, or a complete loss of protection. For example, the attacker is able to modify any/all files protected by the vulnerable system. Alternatively, only some files can be modified, but malicious modification would present a direct, serious consequence to 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.

Definitions: FIRST CVSS v4.0 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 26 May 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 dozzle and amir20/dozzle to 10.5.2.

Affected software

Product	Affected	Fixed in
amir20dozzle	Affected <10.5.2	Fixed in 10.5.2
GitHubamir20/dozzle`pkg:github/amir20/dozzle`Other threats	Affected <10.5.2	Fixed in 10.5.2

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

AI-suggested

Upgrade Dozzle to version 10.5.2 or later, where the origin validation issue in the WebSocket upgrader is fixed. No other mitigations are indicated. Patch status is not explicitly confirmed in vendor advisory content, but the fix is stated to be in version 10.5.2.

Description

Dozzle versions prior to 10.5.2 contain an origin validation vulnerability in the WebSocket upgrader for the /exec and /attach endpoints. The CheckOrigin function accepts requests from any origin, combined with a JWT cookie set with SameSite: Lax, enabling Cross-Site WebSocket Hijacking (CSWSH). An attacker on a same-site origin can exploit this to gain interactive shell access to containers accessible by the victim. This vulnerability is fixed in version 10.5.2.

Impact

Exploitation of this vulnerability allows an attacker on a same-site origin to hijack WebSocket connections authenticated by the victim's JWT cookie, gaining interactive shell access to Docker containers the victim can access. This compromises container integrity and confidentiality, potentially leading to unauthorized command execution within containers.

Summary

Dozzle, a realtime log viewer for Docker containers, had a security flaw in versions before 10.5.2 where the WebSocket upgrader's origin check was effectively disabled by always returning true. This allowed any origin to initiate WebSocket connections to sensitive endpoints (/exec and /attach). Because the JWT authentication cookie uses SameSite: Lax, an attacker hosting a page on a same-site origin (such as a sibling subdomain or localhost service) could leverage the victim's valid JWT cookie to hijack the WebSocket connection. This results in unauthorized interactive shell access to containers the victim is authorized to access. The vulnerability is identified as CWE-346 (Origin Validation Error) and is rated with a CVSS 4.0 score of 8.7 (high severity). The issue is resolved in Dozzle version 10.5.2.

CWE-346Origin Validation Error (opens in a new tab)
Class weaknessOWASP Top 10 A07:2025: Authentication Failures (opens in a new tab)
The product does not properly verify that the source of data or communication is valid.
OWASP Cheat Sheets
OWASP Authentication (opens in a new tab)
OWASP ASVS 4.0.3
V14.5.2 (opens in a new tab)
V14.5.3 (opens in a new tab)
V1.4.4 (opens in a new tab)
Attack patterns
JSON Hijacking (aka JavaScript Hijacking) (opens in a new tab)
Cache Poisoning (opens in a new tab)
DNS Cache Poisoning (opens in a new tab)
Exploit Script-Based APIs (opens in a new tab)
Application API Message Manipulation via Man-in-the-Middle (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 3 Jun 2026, 20:49 UTC

WeaknessesCWE-346

Technical details

References

Community reviews

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