Security readout for executives and security teams
Plain-English summary
This issue affects server-side HTML-to-PDF conversion using Apryse HTML2PDF SDK. If untrusted HTML reaches InsertFromHtmlString(), an attacker may make the server read local files or request internal/external URLs. The main business risk is sensitive-data exposure from systems that assumed PDF generation was a harmless content-rendering operation.
Executive priority
Prioritize within the normal high-severity remediation lane, especially for internet-facing document workflows or multi-tenant services. Treat as urgent if PDF generation handles untrusted customer content or runs with broad network and file access.
Technical view
InsertFromHtmlString in Apryse HTML2PDF SDK through 11.6.0 can allow LFI and SSRF. CVSS 3.1 is 7.5: network reachable, low complexity, no privileges, no user interaction, unchanged scope, high confidentiality impact, and no stated integrity or availability impact.
Likely exposure
Exposure is most likely in applications using Apryse HTML2PDF SDK 11.6.0 or earlier where attacker-controlled HTML is converted server-side. Public product metadata in the bundle is incomplete, so confirm dependency use in code, containers, and vendor-supplied components.
Exploitation context
The bundle does not show CISA KEV listing or confirmed active exploitation. The issue is still serious because SSRF can reach internal services and LFI can expose server-side files, depending on deployment permissions and network access.
Researcher notes
The source bundle names Apryse HTML2PDF SDK through 11.6.0 and InsertFromHtmlString, but affected CPE/vendor fields are listed as n/a. No exploit procedure or patch version is provided in the bundle; validation should focus on dependency presence, call paths, and runtime access boundaries.
Mitigation direction
- Inventory Apryse HTML2PDF SDK usage and versions across applications.
- Check Apryse and Stratascale guidance for fixed versions or vendor mitigations.
- Avoid passing untrusted HTML into InsertFromHtmlString where feasible.
- Restrict server egress to internal metadata, admin, and private services.
- Limit file-system permissions available to PDF conversion processes.
- Monitor PDF conversion services for unusual file and URL access patterns.
Validation and detection
- Confirm whether Apryse HTML2PDF SDK is present in application dependencies.
- Identify code paths calling InsertFromHtmlString with user-controlled content.
- Review deployed versions for 11.6.0 or earlier.
- Check whether conversion workers can access sensitive local files.
- Check whether conversion workers can reach internal-only HTTP services.
- Review logs for unexpected outbound requests during PDF generation.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-918: Information exposure and cloud metadata lookup
Information exposure and SSRF weaknesses can make discovery, cloud metadata, and credential material review relevant. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCloud metadata behavior lookup
The CVE wording references SSRF or metadata access, so cloud discovery and credential material review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2025-56589 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 7.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N3.93.6CISA-ADPVulnerability scoring details
Base CVSS 3.1 score
7.5HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://www.stratascale.com/resource/apryse-server-module-ssrf-lfi/CVE reference, mitre
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Server-Side Request Forgery (SSRF)
Server-Side Request Forgery (SSRF) represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.