pysaml2 version 4.4.0 and older accept any password when run with python optimizations enabled.
pysaml2 version 4.4.0 and older accept any password when run with python optimizations enabled. This allows attackers to log in as any user without knowing their password.
- Published
- Jan 2, 2018
- Updated
- Jun 16, 2026
- EPSS
- 2.5% · 84th percentile
- CWE
- CWE-287
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Report tools
Action score
33
Monitor
Low priority for now.
- CVSS
- 32 / 40 · 8.1 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 1 / 30 · 2.5%
Affected systems
| Vendor | Product | CPE |
|---|---|---|
| pysaml2 project | pysaml2 | cpe:2.3:a:pysaml2_project:pysaml2 |
| debian | debian linux | cpe:2.3:o:debian:debian_linux |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- debian debian linux8.0
- debian debian linux9.0
- pysaml2 project pysaml2up to 4.4.0 inclusive
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:12 | python-pysaml2 | before 4.5.0-2 | 4.5.0-2 |
| Debian:8 | python-pysaml2 | before 2.0.0-1+deb8u2 | 2.0.0-1+deb8u2 |
| Debian:9 | python-pysaml2 | before 3.0.0-5+deb9u2 | 3.0.0-5+deb9u2 |
| PyPI | pysaml2 | before 4.5.0 | 4.5.0 |
| SUSE:OpenStack Cloud 7 | caasp-openstack-heat-templates | before 1.0+git.1553079189.3bf8922-1.6.2 | 1.0+git.1553079189.3bf8922-1.6.2 |
| SUSE:OpenStack Cloud 7 | crowbar | before 4.0+git.1551088848.823bcaa3-7.29.2 | 4.0+git.1551088848.823bcaa3-7.29.2 |
| SUSE:OpenStack Cloud 7 | crowbar-core | before 4.0+git.1556285635.ab602dd4d-9.46.3 | 4.0+git.1556285635.ab602dd4d-9.46.3 |
| SUSE:OpenStack Cloud 7 | crowbar-ha | before 4.0+git.1556181005.47c643d-4.46.3 | 4.0+git.1556181005.47c643d-4.46.3 |
| SUSE:OpenStack Cloud 7 | crowbar-openstack | before 4.0+git.1554887450.ff7c30c1c-9.51.3 | 4.0+git.1554887450.ff7c30c1c-9.51.3 |
| SUSE:OpenStack Cloud 7 | galera-python-clustercheck | before 0.0+git.1506329536.8f5878c-1.6.2 | 0.0+git.1506329536.8f5878c-1.6.2 |
| SUSE:OpenStack Cloud 7 | openstack-ceilometer | before 7.1.1~dev4-4.15.3 | 7.1.1~dev4-4.15.3 |
| SUSE:OpenStack Cloud 7 | openstack-ceilometer-doc | before 7.1.1~dev4-4.15.3 | 7.1.1~dev4-4.15.3 |
| SUSE:OpenStack Cloud 7 | openstack-heat-gbp | before 5.1.1~dev1-2.6.3 | 5.1.1~dev1-2.6.3 |
| SUSE:OpenStack Cloud 7 | python-PyKMIP | before 0.5.0-3.3.3 | 0.5.0-3.3.3 |
| SUSE:OpenStack Cloud 7 | python-pysaml2 | before 4.0.2-3.3.2 | 4.0.2-3.3.2 |
| SUSE:OpenStack Cloud 7 | python-pysaml2 | before 4.0.2-3.6.3 | 4.0.2-3.6.3 |
| SUSE:OpenStack Cloud 7 | rubygem-crowbar-client | before 3.9.0-7.14.2 | 3.9.0-7.14.2 |
Same product
pysaml2 project: all recordsOther highest-scoring records for the same primary product.
- CVE-2016-10127PySAML2 allows remote attackers to conduct XML external entity (XXE) attacks via a crafted SAML XML request or response.37Monitor
- CVE-2016-10149XML External Entity (XXE) vulnerability in PySAML2 4.4.0 and earlier allows remote attackers to read arbitrary files via a crafted SAML XML 32Monitor
- CVE-2020-5390PySAML2 before 5.0.0 does not check that the signature in a SAML document is enveloped and thus signature wrapping is effective, i.e., it is30Monitor
- CVE-2021-21239Open default xmlsec1 key-type preference26Monitor
- CVE-2021-21238SAML XML Signature wrapping26Monitor
- CVE-2017-1000246Python package pysaml2 version 4.4.0 and earlier reuses the initialization vector across encryptions in the IDP server, resulting in weak en21Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| debian:python-pysaml2 | 4.5.0-2 · Debian:12 | Package registry (OSV) |
| PyPI:pysaml2 | 4.5.0 | Package registry (OSV) |
| suse:caasp-openstack-heat-templates | 1.0+git.1553079189.3bf8922-1.6.2 · SUSE:OpenStack Cloud 7 | Package registry (OSV) |
| suse:crowbar | 4.0+git.1551088848.823bcaa3-7.29.2 · SUSE:OpenStack Cloud 7 | Package registry (OSV) |
| suse:crowbar-core | 4.0+git.1556285635.ab602dd4d-9.46.3 · SUSE:OpenStack Cloud 7 | Package registry (OSV) |
| suse:crowbar-ha | 4.0+git.1556181005.47c643d-4.46.3 · SUSE:OpenStack Cloud 7 | Package registry (OSV) |
| suse:crowbar-openstack | 4.0+git.1554887450.ff7c30c1c-9.51.3 · SUSE:OpenStack Cloud 7 | Package registry (OSV) |
| suse:galera-python-clustercheck | 0.0+git.1506329536.8f5878c-1.6.2 · SUSE:OpenStack Cloud 7 | Package registry (OSV) |
| suse:openstack-ceilometer | 7.1.1~dev4-4.15.3 · SUSE:OpenStack Cloud 7 | Package registry (OSV) |
| suse:openstack-ceilometer-doc | 7.1.1~dev4-4.15.3 · SUSE:OpenStack Cloud 7 | Package registry (OSV) |
| suse:openstack-heat-gbp | 5.1.1~dev1-2.6.3 · SUSE:OpenStack Cloud 7 | Package registry (OSV) |
| suse:python-PyKMIP | 0.5.0-3.3.3 · SUSE:OpenStack Cloud 7 | Package registry (OSV) |
| suse:python-pysaml2 | 4.0.2-3.3.2 · SUSE:OpenStack Cloud 7 | Package registry (OSV) |
| suse:rubygem-crowbar-client | 3.9.0-7.14.2 · SUSE:OpenStack Cloud 7 | Package registry (OSV) |
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
- Anyone who can reach it over the internet can trigger it.
- No account or password is required.
- No user action is required.
- Special conditions such as timing or configuration are required.
If successful
- Confidentiality
- high · data can be read
- Integrity
- high · data or configuration can be modified
- Availability
- high · the service can be disrupted
- Attack vector
- Network
- Attack complexity
- High
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
Weakness class (CWE)
CWE-287 · Improper AuthenticationCVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
nvd-primary
Root cause
Authentication is added route by route instead of being enforced in one place. When a route added later bypasses the shared middleware, the session check never runs for it.
The bug in code
The whole CWE-287 classA representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.
Vulnerable
app.use("/admin", requireSession, adminRouter);
// Route added later skips the middlewareapp.post("/admin-api/config", updateConfig);Fixed
const admin = express.Router();admin.use(requireSession, requireRole("admin"));
admin.post("/config", updateConfig);app.use("/admin", admin);Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
Attack patterns (CAPEC)
- Authentication AbuseCAPEC-114Medium
- Authentication BypassCAPEC-115Medium
- Identity SpoofingCAPEC-151likelihood: Medium · Medium
- Fake the Source of DataCAPEC-194Medium
- Exploiting Trust in ClientCAPEC-22likelihood: High · High
- Utilizing REST's Trust in the System Resource to Obtain Sensitive DataCAPEC-57likelihood: Medium · Very High
- Session HijackingCAPEC-593likelihood: High · Very High
- Token ImpersonationCAPEC-633Medium
ATT&CK techniques
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpChange log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- github.com/rohe/pysaml2/issues/451
- lists.debian.org/debian-lts-announce/2018/07/msg00000.html
- lists.debian.org/debian-lts-announce/2021/02/msg00038.html
- security.gentoo.org/glsa/201801-11
Vendor advisories and official records. Exploit/PoC links are deliberately left out.