VulnerabilityPublished 10 Sep 2026Updated 29 Sep 2026

CVE-2026-88882: renovatebot renovate · Open Redirect

Affects renovatebot renovateSource CVE Database V5

Not known to be exploited · CVSS 9.2 Critical : upgrade to 44.11.2 as a priority.

Data as of 26 Oct 2026, 17:16 UTC

CVSS 4.0 base score

9.2Critical

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

EPSS: 0.4% chance of exploitation in 30 days – higher than 34% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 44.11.2, 15.4.0, 10.4.0

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

Attack Vector: Network
Attack Complexity: Low
Attack Requirements: None
Privileges Required: None
User Interaction: None
Vulnerable system confidentiality: High
Vulnerable system integrity: None
Vulnerable system availability: None
Subsequent system confidentiality: High
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: 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: High: There is a total loss of confidentiality, resulting in all resources within the Subsequent 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.
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 10 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: 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 26 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.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, 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 renovate and renovatebot/renovate to 44.11.2; renovate-ce and renovate-ee-server and renovate-ee-worker and mend-renovate-ce to 15.4.0; mend-renovate-enterprise-edition to 10.4.0.

Affected software

Product	Affected	Fixed in
renovatebotrenovate	Affected <44.11.2	Fixed in 44.11.2
mendrenovate-ce	Affected <15.4.0	Fixed in 15.4.0
mendrenovate-ee-server	Affected <15.4.0	Fixed in 15.4.0
mendrenovate-ee-worker	Affected <15.4.0	Fixed in 15.4.0
mendmend-renovate-ce	Affected <15.4.0	Fixed in 15.4.0
mendmend-renovate-enterprise-edition	Affected <10.4.0	Fixed in 10.4.0

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

AI-suggested

Upgrade Renovate to version 44.11.2 or later, Mend Renovate CE/EE images and charts to 15.4.0 or later, and mend-renovate-enterprise-edition helm chart to 10.4.0 or later. These versions include a fix that restricts pagination URLs to the same origin as the configured registry. Avoid enabling the RENOVATE_X_NUGET_PAGINATION_ALLOW_CROSS_ORIGIN option unless necessary and you understand the risks. Patch status is confirmed fixed in these versions.

Description

Renovate is a dependency update automation tool. In versions before 44.11.2 (and Mend Renovate CE/EE images and charts before 15.4.0, and mend-renovate-enterprise-edition helm chart before 10.4.0), when listing new package versions from a NuGet registry Renovate follows pagination URLs supplied by the registry in the HTTP `Link` header without verifying that the target has the same origin as the configured registry. Registry credentials are attached to the request for the 'next' page, so a malicious or compromised NuGet registry can return a `Link` header pointing at an attacker-controlled server and cause Renovate to send the registry credentials to that server. Exploitation requires the remote registry to be malicious or compromised; such a registry would normally already have received the credentials on the initial request, so the issue primarily allows the credentials to be delivered to an additional, attacker-chosen host. The fix restricts pagination to the same origin; the previous behaviour can be re-enabled with the RENOVATE_X_NUGET_PAGINATION_ALLOW_CROSS_ORIGIN option.

Impact

An attacker controlling or compromising a NuGet registry can cause Renovate to send registry credentials to an attacker-controlled server via an open redirect in pagination URLs. This could lead to credential exposure beyond the originally compromised registry. However, since the attacker must already control or compromise the registry to exploit this, the incremental impact is limited to credential exposure to an additional host.

Summary

Renovate versions before 44.11.2 (and Mend Renovate CE/EE images and charts before 15.4.0 and 10.4.0) do not verify the origin of pagination URLs provided by a NuGet registry in the HTTP Link header. When listing new package versions, Renovate follows these URLs and attaches registry credentials to the requests. A malicious or compromised NuGet registry can exploit this by returning a Link header pointing to an attacker-controlled server, causing credentials to be sent to that server. Exploitation requires control or compromise of the NuGet registry, which would already have access to credentials, so this vulnerability primarily expands the exposure of credentials to an additional host. The fix enforces same-origin restrictions on pagination URLs, preventing cross-origin redirection unless explicitly allowed via the RENOVATE_X_NUGET_PAGINATION_ALLOW_CROSS_ORIGIN option.

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 30 Sep 2026, 01:47 UTC

Technical details

References

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