VulnerabilityPublished 6 Aug 2026

CVE-2026-18359: Scripta eScriptorium · Server-Side Request Forgery (SSRF)

Affects Scripta eScriptoriumSource CVE Database V5

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Not known to be exploited · CVSS 8.5 High : upgrade to 26.04.2 soon.

Data as of 5 Nov 2026, 23:24 UTC

CVSS 3.1 base score

8.5High

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 26.04.2

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N

Attack Vector: Network
Attack Complexity: Low
Privileges Required: Low
User Interaction: None
Scope: Changed
Confidentiality: High
Integrity: Low
Availability: None

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

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, 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: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: Low: The attacker is authorized with (i.e., requires) privileges that provide basic user capabilities that could normally affect only settings and files owned by a user. Alternatively, an attacker with Low privileges may have the ability to cause an impact only to non-sensitive resources.
User Interaction: None: The vulnerable system can be exploited without any interaction from any user.
Scope: Changed: An exploited vulnerability can affect resources beyond the security scope managed by the security authority of the vulnerable component. In this case, the vulnerable component and the impacted component are different and managed by different security authorities.
Confidentiality: High: There is total loss of confidentiality, resulting in all resources within the impacted component being divulged to the attacker. Alternatively, access to only some restricted information is obtained, but the disclosed information presents a direct, serious impact.
Integrity: Low: Modification of data is possible, but the attacker does not have control over the consequence of a modification, or the amount of modification is limited. The data modification does not have a direct, serious impact on the impacted component.
Availability: None: There is no impact to availability within the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 6 Aug 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 5 Nov 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 scripta/escriptorium to 26.04.2.

Affected software

Product	Affected	Fixed in
ScriptaeScriptorium	Affected <=26.4.1	Fixed in–
GitHubscripta/escriptorium`pkg:github/scripta/escriptorium`Other threats	Affected <26.04.2	Fixed in 26.04.2

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

AI-suggested

Until a patch or official fix is available, restrict access to the import API endpoint to trusted users only and consider implementing network-level controls to limit the server's ability to make outbound HTTP requests to internal or sensitive endpoints. Review and adjust the IMPORT_ALLOWED_DOMAINS setting to restrict allowed domains explicitly rather than using the default wildcard '*'.

Description

CVE-2026-18359 is a server-side request forgery (SSRF) vulnerability in Scripta eScriptorium versions prior to 26.04.2. It arises from the METS and IIIF import URI handling, where an authenticated remote user can cause the server to make arbitrary HTTP requests to internal hosts. This is due to the default setting of IMPORT_ALLOWED_DOMAINS to '*' and the lack of address filtering, redirect caps, or timeouts on the mets_uri or iiif_uri parameters in the import API endpoint.

Impact

An authenticated attacker can leverage this SSRF vulnerability to make the server issue arbitrary HTTP requests to internal systems, potentially accessing sensitive internal services such as cloud instance metadata endpoints. This can lead to information disclosure (high confidentiality impact) and limited integrity impact. Availability is not affected. The CVSS v3.1 base score is 8.5 (high severity), reflecting the ease of exploitation with low attack complexity and the significant confidentiality impact.

Summary

This vulnerability (CWE-918) affects Scripta eScriptorium through version 26.04.1, allowing authenticated users to exploit the METS and IIIF import URI handling functionality. The server accepts URIs via the mets_uri or iiif_uri parameters in POST requests to /api/documents/{pk}/imports/ without proper domain restrictions or request controls. Because the IMPORT_ALLOWED_DOMAINS setting defaults to '*', the server can be coerced into making arbitrary HTTP requests to internal network resources, including sensitive cloud instance metadata services. No official remediation level or patch is currently documented, and no known exploits in the wild have been reported.

CWE-918Server-Side Request Forgery (opens in a new tab)
Base weaknessCWE Top 25 (2025): #22OWASP Top 10 A01:2025: Broken Access Control (opens in a new tab)
The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.
Implementation · Operation
If there is a known list of applications, IP, hostname, and/or domains to which the product is allowed to communicate, then use allowlists to ensure that outgoing requests are restricted to these known entities. The allowlists could be in the application code or possibly enforced by firewalls or network segmentation.
Implementation · Operation
If the product is expected to be able to connect to arbitrary IP addresses or domains, consider using a denylist that includes private network addresses, internal domain names, etc. The denylist could be in the application code or possibly enforced by firewalls or network segmentation.
Implementation · Input Validation
Assume all input is malicious. Use an "accept known good" input validation strategy, i.e., use a list of acceptable inputs that strictly conform to specifications. Reject any input that does not strictly conform to specifications, or transform it into something that does.
OWASP Cheat Sheets
Server Side Request Forgery Prevention (opens in a new tab)
Unvalidated Redirects and Forwards (opens in a new tab)
Cross Site Scripting Prevention (opens in a new tab)
DOM based XSS Prevention (opens in a new tab)
Authorization (opens in a new tab)
OWASP ASVS 4.0.3
V12.6.1 (opens in a new tab)
V5.2.6 (opens in a new tab)
Attack patterns
Server Side Request Forgery (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

gitlab.com/scripta/escriptorium/-/work_items/1230 (opens in a new tab)

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 13 Aug 2026, 17:02 UTC

WeaknessesCWE-918

Technical details

References

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